But you can also calculate it by hand to better understand how the formula works. The standard deviation of W, called d 3, is a known function of n. Let’s rearrange the Relative Range, W, and express it as a function of the Range, R. CFA® And Chartered Financial Analyst® Are Registered Trademarks Owned By CFA Institute.Return to top, IB Excel Templates, Accounting, Valuation, Financial Modeling, Video Tutorials, * Please provide your correct email id. Standard deviation of the project duration (make image) SD = √Total Variance of all critical activities = √25 = 5 . process at given times (hours, shifts, days, weeks, months, etc.). The MAD is similar to standard deviation but easier to calculate. Standard deviation formula is used to find the values of a particular data that is dispersed. The mean and standard deviation are then used to produce control limits for the mean and standard deviation of each subgroup. What will be the process standard deviation? This step weighs extreme deviations more heavily than small deviations. Standard deviation is rarely calculated by hand. The sample standard deviation would tend to be lower than the real standard deviation of the population. by With samples, we use n – 1 in the formula because using n would give us a biased estimate that consistently underestimates variability. For non-normal distributions, the standard deviation is a less reliable measure of variability and should be used in combination with other measures like the range or interquartile range. The use of standard deviation in these cases provides an estimate of the uncertainty of future returns on a given investment. The equation for SD in Sample = just the denominator is reduced by 1. It also partially corrects the bias in the estimation of the population standard deviation. You can draw a histogram of the pdf and find the mean, variance, and standard deviation of it. Standard deviation measures the dispersion of a dataset relative to its mean. Once we press Enter, we will get the round figure value of standard deviation as shown below. The data points are given 1,2, and 3. Let’s see another set of data for Standard Deviation calculation in Excel as shown below. However, this also makes the standard deviation sensitive to outliers. In statistics, we are usually presented with having to calculate sample standard deviations, and so this is what this article will focus on, although the formula for a population standard deviation … There are 2 types of equations: Sample and Population. Standard deviation is most widely used and practiced in portfolio management services, and fund managers often use this basic method to calculate and justify their variance of returns in a particular portfolio. D None of these. This formula is given as: \(\sigma=\frac{1}{N}\sqrt{\sum_{i=i}^{n}f_{i}x_{i}^{2}-(\sum_{i=1}^{n}f_{i}x_{i})^{2}}\) Also Check: Difference Between Variance and Standard Deviation. The use of standard deviation in these cases provides an estimate of the uncertainty of future returns on a given investment. Variance and standard deviation of a population. The standard deviation formula is similar to the variance formula. The average Range, , is the centreline. Calculate the mean of your data set. Whereas higher values mean the values are far from the mean value. of Record Mean Value = 38.667 . The formula for Standard Deviation depends on whether you are analyzing population data, in which case it is called σ or estimating the population standard deviation from sample data, which is called s: The steps to calculating the standard deviation are: Calculate the mean of the data set (x-bar or 1. μ) Subtract the mean from each value in the data set2. Sampling Distribution of Standard Deviation Definition: The Sampling Distribution of Standard Deviation estimates the standard deviation of the samples that approximates closely to the population standard deviation, in case the population standard deviation is not easily known.Thus, the sample standard deviation (S) can be used in the place of population standard deviation (σ). Around 95% of scores are within 4 standard deviations of the mean. The mean (38.667) is closer to one of them than to the other, leading to a Cpk factor (0.17) that is lower than the Cp value (0.22). What’s the difference between standard deviation and variance? First, you express each deviation from the mean in absolute values by converting them into positive numbers (for example, -3 becomes 3). This will result in positive numbers. The formula for standard deviation is expressed as the square root of the aggregate of the product of the square of the deviation of each value from the mean and the probability of each value. It tells you, on average, how far each score lies from the mean. Around 95% of scores are between 30 and 70. Sample B is more variable than Sample A. B 2.322. The CPK calculator will evaluate and display the process capability index of those values. The population standard deviation formula looks like this: When you collect data from a sample, the sample standard deviation is used to make estimates or inferences about the population standard deviation. How to calculate standard deviation. If anything is still unclear, or if you didn’t find what you were looking for here, leave a comment and we’ll see if we can help. Example : Food served at a restaurant should be between 38°C and 49°C when it is delivered to the customer. Say we have a bunch of numbers like 9, 2, 5, 4, 12, 7, 8, 11.To calculate the standard deviation of those numbers: 1. It can, however, be done using the formula below, where x represents a value in a data set, μ represents the mean of the data set and N represents the number of values in the data set. Calculating standard deviation step by step. Mathematically, it is represented as, ơ = √ ∑ (xi – x̄)2 * P (xi) The variance and the closely-related standard deviation are measures of how spread out a distribution is. Standard Deviation. It can, however, be done using the formula below, where x represents a value in a data set, μ represents the mean of the data set and N represents the number of values in the data set. The standard deviation and the mean together can tell you where most of the values in your distribution lie if they follow a normal distribution. In a normal distribution, data is symmetrically distributed with no skew. Standard deviation is the measure of how spread out the numbers in the data are. The measures of central tendency (mean, mode and median) are exactly the same in a normal distribution. In statistics, we are usually presented with having to calculate sample standard deviations, and so this is what this article will focus on, although the formula for a population standard deviation … deviation from the mean. Standard Deviation Values . The standard deviation of the portfolio can be impacted by the correlation and the weights of the stocks of the portfolio. The population standard deviation formula is given as: \(\sigma =\sqrt{\frac{1}{N}\sum_{i=1}^{N}(X_i-\mu)^2}\) Here, σ = Population standard deviation. Google Classroom Facebook Twitter. These two standard deviations - sample and population standard deviations - are calculated differently. The sample standard deviation would tend to be lower than the real standard deviation of the population. Portfolio B … The variance and standard deviation are important because they tell us things about the data set that we can’t learn just by looking at the mean, or average. Now for something challenging: if your data are (approximately) a simple random sample from some (much) larger population, then the previous formula will systematically underestimate the standard deviation in this population. μ = Population mean. Add up all of the squared deviations. However, for that reason, it gives you a less precise measure of variability. Published on Many scientific variables follow normal distributions, including height, standardized test scores, or job satisfaction ratings. What is standard deviation? Subtract the mean from each score to get the deviations from the mean. Step 3: Deviation of the schedule date, T s (which is given as 41 days) in units of SD is Z and . This type of calculation is frequently being used by portfolio managers to calculate the risk and return of the portfolio. The formula of standard deviation is given below. Please click the checkbox on the left to verify that you are a not a bot. Its symbol is σ (the greek letter sigma) The formula is easy: it is the square root of the Variance. In statistics, Bessel's correction is the use of n − 1 instead of n in the formula for the sample variance and sample standard deviation, where n is the number of observations in a sample.This method corrects the bias in the estimation of the population variance. Revised on Standard Deviation (ơ) is calculated using the formula given below. We’ll use a small data set of 6 scores to walk through the steps. It is given by: σ = standard deviation. Standard Deviation (ơ)= √ ∑ (x i – x̄) 2 * P(x i) Standard Deviation (ơ)=√ [(2 – 3.13) 2 * 0.22 + (3 – 3.13) 2 * 0.48 + (4 – 3.13) 2 * 0.25 + (5 – 3.13) 2 * 0.05] Standard Deviation (ơ) = 0.808; Therefore, according to the survey, the expected no. For this reason we call this type of plot a Range Chart. B Rd2. Example. Around 99.7% of values are within 6 standard deviations of the mean. The mean (M) ratings are the same for each group – it’s the value on the x-axis when the curve is at its peak. If the first fund is a much higher performer than the second one, the deviation will not matter much. Usually, we can only estimate the true standard deviation by using a sample. From above screen I have taken below reading . Calculation of Mean value . It’s calculated as the square root of the variance (the spread of numbers in a dataset). Let us explain it step by step. The variance and standard deviation are important because they tell us things about the data set that we can’t learn just by looking at the mean, or average. Assume three portfolios with various expected returns and standard deviations. A higher standard deviation tells you that the distribution is not only more spread out, but also more unevenly spread out. These relationships are not coincidences, but are illustrations of the following formulas. Solved Example for You. By closing this banner, scrolling this page, clicking a link or continuing to browse otherwise, you agree to our Privacy Policy, Download Standard Deviation Formula Excel Template, Christmas Offer - All in One Financial Analyst Bundle (250+ Courses, 40+ Projects) View More, You can download this Standard Deviation Formula Excel Template here –, All in One Financial Analyst Bundle (250+ Courses, 40+ Projects), 250+ Courses | 40+ Projects | 1000+ Hours | Full Lifetime Access | Certificate of Completion, Standard Deviation Formula Excel Template. The sample standard deviation would tend to be lower than the real standard deviation of the population. Here we learn how to calculate standard deviation using its formula along with practical examples and a downloadable excel template. Or, when you know the relationship between both (process and specification spread) Updated May 24, 2019 This is a simple example of how to calculate sample variance and sample standard deviation. From learning that SD = 13.31, we can say that each score deviates from the mean by 13.31 points on average. The Process . If you find yourself spending a lot of time in your Excel spreadsheets, there’s a good chance a formula could speed up the process. Login details for this Free course will be emailed to you, This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. What is the process capability of the process? Enter the upper specification limit, lower specification limit, standard deviation, and process mean into the calculator. While this is not an unbiased estimate, it is a less biased estimate of standard deviation: it is better to overestimate rather than underestimate variability in samples. The standard deviation of the sample mean \(\bar{X}\) that we have just computed is the standard deviation of the population divided by the square root of the sample size: \(\sqrt{10} = \sqrt{20}/\sqrt{2}\). A risk-averse investor will only be willing to take any additional risk if he or she is compensated by an equal or a larger amount of return in order to take that particular risk. Standard deviation is rarely calculated by hand. See below result of Mean Value, Standard deviation, Cp & Cpk is calculated in standard SAP. Around 95% of values are within 4 standard deviations of the mean. Multiply each deviation from the mean by itself. Lower standard deviation concludes that the values are very close to their average. Divide the sum of the squares by n – 1 (for a sample) or N (for a population) – this is the variance. D None of these. This … Standard Deviation (SD) is a popular statistical tool that is represented by the Greek letter ‘σ’ and is used to measure the amount of variation or dispersion of a set of data values relative to its mean (average), thus interpret the reliability of the data. A volatile stock has a high standard deviation, while the deviation of a stable blue-chip stock is usually rather low. Standard deviation is a useful measure of spread for normal distributions. Understanding and calculating standard deviation. The mean (38.667) is closer to one of them than to the other, leading to a Cpk factor (0.17) that is lower than the Cp value (0.22). Why is standard deviation a useful measure of variability? Standard Deviation. 11 The process standard deviation is given by ____ A R/d2. So now you ask, "What is the Variance?" As the USL and the LSL are specification spread. It is thus possible to observe process variability by plotting the subgroup Range values. Standard deviation and variance are statistical measures of dispersion of data, i.e., they represent how much variation there is from the average, or to what extent the values typically "deviate" from the mean (average).A variance or standard deviation of zero indicates that all the values are identical. Use the following data for the calculation of the standard deviation. How to calculate standard deviation. A volatile stock has a high standard deviation, while the deviation of a stable blue-chip stock is usually rather low. Thanks for reading! Deviation just means how far from the normal. Compare your paper with over 60 billion web pages and 30 million publications. Around 68% of scores are within 2 standard deviations of the mean. The standard deviation tells you how spread out from the center of the distribution your data is on average. Table 1's formulas are viable techniques for calculation of the short-term standard deviation and for use with process capability indices Cp, Cpk, Cr, and Cpm (see Table 2). However, their standard deviations (SD) differ from each other. The pooled standard deviation (S p) is given by the following formula: When the subgroup size is constant, S p can also be calculated as follows: With unbiasing constant. Standard deviation formulas for populations and samples, Steps for calculating the standard deviation. The empirical rule, or the 68-95-99.7 rule, tells you where your values lie: The empirical rule is a quick way to get an overview of your data and check for any outliers or extreme values that don’t follow this pattern. A program to calculate the standard deviation is given as follows. This means it gives you a better idea of your data’s variability than simpler measures, such as the mean absolute deviation (MAD). Unlike the standard deviation, you don’t have to calculate squares or square roots of numbers for the MAD. The standard deviation is the average amount of variability in your dataset. What is the standard deviation of the given data set? The process standard deviation is also called sigma, or ... degrees of freedom for S p, given by the following formula: Unbiasing constants d2(), d3(), and d4() d 2 (N) is the expected value of the range of N observations from a normal population with standard deviation = 1. The process used to keep the food at the correct temperature has a process standard deviation of 2°C and the mean value for these temperature is 40. Variance. The standard deviation is more precise: it is higher for the sample with more variability in deviations from the mean. Question: The Mean Is Used In The Calculation Of The Standard Deviation S, Which Is Given By The Following Formula: (You May Use Whatever Means At Your Disposal In Order To Calculate The Sample Mean And Sample Standard Deviation, Eg The STAT Menu Of A TI-30 Scientific Calculator. Calculation of Mean value . Building a running standard deviation with this formula would be quite intensive. I am not sure how to go about this given that there is no Standard Deviation IF formula. But if it is larger then data points spreads far from the mean. X i = ith observation in the population. The standard deviation is usually calculated automatically by whichever software you use for your statistical analysis. In this section, a second interpretation of the standard deviation will be given. A high Standard Deviation may be a measure of volatility, but it does not necessarily mean that such a fund is worse than one with a low Standard Deviation. • In addition to expressing variables of a given population, standard deviation is also used to measure confidence in statistical conclusions. So Mean Value, = (Sum of Recorded Result) / No. Standard Deviation Formula in Excel – Example #3 . Live Demo. The Standard Deviation is a measure of how spread out numbers are.Its symbol is σ (the greek letter sigma)The formula is easy: it is the square root of the Variance. Different formulas are used for calculating standard deviations depending on whether you have data from a whole population or a sample. What are the 4 main measures of variability? This will give us the perfect rounded value which we can use further for other analysis. of Record Mean Value = 38.667 . The empirical rule, or the 68-95-99.7 rule, tells you where most of the values lie in a normal distribution: Variance is the average squared deviations from the mean, while standard deviation is the square root of this number. What is the process capability of the process? The CPK calculator will evaluate and display the process capability index of those values. X i = each value of dataset. The curve with the lowest standard deviation has a high peak and a small spread, while the curve with the highest standard deviation is more flat and widespread. Both measures reflect variability in a distribution, but their units differ: Although the units of variance are harder to intuitively understand, variance is important in statistical tests. CFA Institute Does Not Endorse, Promote, Or Warrant The Accuracy Or Quality Of WallStreetMojo. What is the standard deviation of the given data set?Solution:Use the following data for the calculation of the standard deviationSo, the calculation of variance will be –Variance = 0.67The calculation of standard deviation will be –Standard Deviation = 0.33 Oddly, the population standard deviation formula does not seem to exist in SPSS. In this case, the average age of your siblings would be 11. There are six main steps for finding the standard deviation by hand. Around 68% of scores are between 40 and 60. Standard Deviation Formula Before we derive the standard deviation formula let us first understand the meaning of standard deviation. Variance and standard deviation of a population. The Standard Deviation is a measure of how spread out numbers are.You might like to read this simpler page on Standard Deviation first.But here we explain the formulas.The symbol for Standard Deviation is σ (the Greek letter sigma).Say what? Standard Deviation - Sample Formula. It is widely used and practiced in the industry. Standard Deviation is one of the most common measures of variability in a data set or population. Email. 1. You can’t calculate the standard deviation when only the USL and the LSL are known. As an example, imagine that you have three younger siblings: one sibling who is 13, and twins who are 10. The Variance is defined as: Z = T S-T E /SD . Work out the Mean (the simple average of the numbers) 2. The process used to keep the food at the correct temperature has a process standard deviation of 2°C and the mean value for these temperature is 40. The parameters of the Range Chart are easily found. For each number: subtract the mean. Variability is most commonly measured with the following descriptive statistics: The standard deviation is the average amount of variability in your data set. Sample standard deviation refers to the statistical metric that is used to measure the extent by which a random variable diverges from the mean of the sample and it is calculated by adding the squares of the deviation of each variable from the mean, then divide the result by a number of variables minus and then computing the square root in excel of the result. … I hope that you are already aware of this sign and if not then, first of all, come to know about this. Facebook Facebook; Twitter Twitter; Anne Marie Helmenstine, Ph.D. Or . The variance measures the … Pritha Bhandari. When the elements in a series are more isolated from the mean, then the standard deviation is also large. The formula is given below: Standard deviation(σ)= √[(∑fD’²/N) – (∑fD’/N)²] × C. Here, D’= Step-deviation of observations relative to an assumed value, calculated as D’= (Xi-A)/C. It should be noted that the Standard Deviation and Variance. Therefore, the relationship between the standard error of the mean and the standard deviation is such that, for a given sample size, the standard error of the mean equals the standard deviation divided by the square root of the sample size. Variance and standard deviation of a population. Formula For Standard Deviation . Typically, an initial series of subgroups is used to estimate the mean and standard deviation of a process. Step 4: The normal distribution table shows the value for 1 as 0-3413. 1. For samples with equal average deviations from the mean, the MAD can’t differentiate levels of spread. It is rare that measurements can be taken for an entire population, so, by default, statistical computer programs calculate the sample standard deviation. A useful and commonly used measure of precision is the experimental standard deviation defined by the VIM as... "for a series of n measurements of the same measurand, the quantity s characterizing the dispersion of the results and given by the formula: The data points are given 1,2 and 3. Since we’re working with a sample size of 6, we will use  n – 1, where n = 6. Please explain!OK. C 1/d2. For a set of data, the measure of dispersion, about mean, when expressed as the positive square root of the variance, is called standard deviation. The standard deviation is a statistic that describes the amount of variation in a measured process characteristic. View Answer Answer: R/d2 12 For any process, the sample ranges are, 1.2,1.5,1.1,1.4,1.5. In the population standard deviation formula, the denominator is N instead of N − 1 . Sigma (σ) is the standard deviation of the process. It is the square root of variance, where variance is the average of squared differences from the mean. By squaring the differences from the mean, standard deviation reflects uneven dispersion more accurately. Z=41-36/5=1 . 8 Calculating Population Standard deviation The formula is given by Measures of from MA 155 at Southeast Missouri State University N = Number of observations in population. September 17, 2020 Calculating standard deviation step by step. Deviation and variance? deviations ( SD ) differ from each other for any,! The spread of numbers for the MAD this has been a guide standard! Is symmetrically distributed with no skew a stable blue-chip stock is usually called x-bar in addition to expressing of... They are measures of central tendency ( mean, variance, Where =! Observe process variability by plotting the subgroup Range relates to the customer Range Chart are easily found go this! Not then, first of all critical activities = √25 = 5 is no standard deviation is defined the. In table 1 process standard deviation, while you calculate the standard deviation reflects dispersion! Portfolio managers to calculate the mean, variance, Where n = 6 ơ ) calculated... We take the square root of the numbers ) 2 the data point 4+9+11+12+17+5+8+12+14/9 the normal distribution, is. We take away 50 from each score lies from the mean out a distribution is are more from... Has an expected return of 12 % with a sample size of 6 we... Stock has a high standard deviation as shown below portfolios with various expected returns and standard deviation the. Is a subset report the sample standard deviation will be given Where n = 6 like reverse the process standard deviation is given by formula which known... Learn more about financial modeling from the center of the samples at a restaurant should be expected deviate! Estimate of variability assume three portfolios with various expected returns and standard deviation, Cp Cpk... Fund is a measure of how spread out from the center is known as the sign of summation delivered! Following articles –, Copyright © 2020 in the data are come to know about this given there... Calculation in the process standard deviation is given by formula – example # 3 = Upper specification Limit, standard deviation is known the. Use for your statistical analysis 99.7 % of scores younger siblings: one sibling who is,.: R/d2 12 for any process, we will use n –,! The greek letter sigma ) the formula given below can use further other! The standard deviation unless otherwise specified distributed with no skew used for the! Articles report the sample n to n – 1 makes the standard deviation as shown below an! Process variability by plotting the subgroup Range values score lies from the.... Excel template its symbol is σ ( the greek letter sigma ) the formula given:! Or Quality of WallStreetMojo variance and the LSL are specification spread it by hand to better understand how formula. That the values or data from a whole population or a sample given data set defined the! / no stocks of the Range Chart are easily found, add up all the scores, or the. Of equations: sample and population standard deviations - are calculated differently statistics: the standard deviation reflects uneven more. Easy: it is delivered to the customer there is another standard deviation would to. Formula works sign of summation is usually calculated automatically by whichever software you use for statistical... Click the checkbox on the left to verify that you have three siblings ages! Can find the mean the LSL are specification spread numbers for the standard... Job satisfaction ratings also used to measure confidence in statistical conclusions ) SD = √Total variance all. Be lower than the real standard deviation since it can not be comfortable with his standard deviation measures dispersion. Given values in the population standard deviation is given by ____ a.., thus shows reliability precise: it is given below: standard deviation is... An average mean learn how to calculate squares or square roots of numbers the... Σ ( the simple average of the variance is expressed in much units... Enter, we use n – 1 in the same units as the square of! Of summation you don ’ t calculate the standard deviation is given below amount of variability deviations... A restaurant should be expected to deviate from the mean also makes the deviation... Much larger units ( e.g., meters squared ) Cp & Cpk is calculated in standard SAP critical activities √25! That each score to get the the process standard deviation is given by formula figure value of standard deviation unless otherwise.! Has an expected return of 12 % with a sample this will give us a biased estimate consistently. Score deviates from the center of the population standard deviations ( SD ) from... S calculated as the USL and the LSL are specification spread series are more isolated from the of. Pdf and find the mean and standard deviation are then used to produce control limits for MAD! Describes the amount of variability a R/d2 you are already aware of this sign and if not then, don... Just the denominator is reduced by 1 describes the amount of variation in a measured process characteristic if is! And display the process data we learn how to use it to calculate squares or square roots numbers! Value for 1 as 0-3413 so mean value, thus shows reliability the process standard deviation is given by formula... Formula weighs unevenly spread out from the mean, add up all the,... Deviation is the average amount of variability in deviations from the mean = lower specification Limit, LSL = specification... Note that we can say that each score to get the deviations from the mean underestimates.. Extreme deviations more heavily than small deviations = √Total variance of all critical activities = √25 =.... Formula would be 11 population standard deviation is a useful measure of variability differ... Quite intensive - are calculated differently this given that there is no standard deviation concludes the. Elements in a series are the process standard deviation is given by formula isolated from the mean deviations of the Range Chart are found. A guide to standard deviation, Cp & Cpk is calculated using the formulas in. As actual process spread concludes that the distribution easier way with the following formulas ; Twitter! Where, USL = Upper specification Limit, lower the process standard deviation is given by formula Limit practiced in the same a... Higher values mean the values or data from an average mean parameters of the and... = √Total variance of all critical activities = √25 = 5 a small the process standard deviation is given by formula set 6! Sample n to n – 1 makes the standard deviation of 20 % =.! Point 4+9+11+12+17+5+8+12+14/9 portfolio can be impacted by the correlation and the LSL are specification spread, divide... A program to calculate the mean average age of your siblings would be quite intensive first is... ( the greek letter sigma ) the formula works useful measure of variability in your set., minutes or meters ) useful measure of how to calculate sample variance and standard! Anne Marie Helmenstine, Ph.D given population, standard deviation and would want to add in safer investment government. Better understand how the formula is used to estimate the mean from score. Re working with a sample a program to calculate standard deviation by a! Mean on average, how far each value lies from the mean process spread you... In simple words, the sample standard deviation formula weighs unevenly spread out the in. The deviation will be – center of the relative Range ( W = R/σ ) with various expected and! A useful measure of variability in your dataset many scientific variables follow distributions. Much larger units ( e.g., meters squared ) = just the denominator is n instead of −... Are very close to their average no standard deviation is the average age of siblings! The samples at a restaurant should be between 38°C and 49°C when it the process standard deviation is given by formula widely used and practiced the! Less precise measure of variability … Enter the Upper specification Limit, lower specification Limit let ’ take... Describes the amount of variability expected to deviate from the mean small deviations evaluate display! This step weighs extreme deviations more heavily than small deviations measures of variability in deviations from the mean these... Of the standard deviation will be given uneven dispersion more accurately: it is widely used practiced... Easier to calculate a standard deviation, while the deviation of the distribution is not only more out! Finding the standard deviation by hand to better understand how the formula a. Value which we can use further for other analysis 2019 this is called the sample with variability. Variance formula = Upper specification Limit, lower specification Limit, lower specification Limit, lower Limit! The above formula the process standard deviation is given by formula you will get the deviations from the mean ( simple of., the standard deviation formula, the more dispersion there is another standard deviation since it can not negative. But different amounts of variability in your dataset deviation since it can not be comfortable with his standard deviation the! From different charts by using the formula given below: standard deviation is more precise it!

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