how to find variance with standard deviation?
193276
['Work out the Mean (the simple average of the numbers)', 'Then for each number: subtract the Mean and square the result (the squared difference).', 'Then work out the average of those squared differences. (Why Square?)']
160117
Variance: Var(X) To calculate the Variance: square each value and multiply by its probability. sum them up and we get Σx2p. then subtract the square of the Expected Value μ
191169
['For each value, find the square of the difference between the value and the mean.', 'Find the sum of the squared differences. ... ', 'Divide them by one less than the number of values. ... ', 'Take the square root of this result. ... ', 'Add the standard deviation to the mean. ... ', 'Subtract the standard deviation from the mean.']
1163923
['To calculate the sample standard deviation, use formulas in this category: STDEV. S, STDEVA, and STDEV.', 'To calculate the standard deviation for an entire population, use formulas in this category: STDEV. P, STDEVPA, and STDEVP.']
393745
The standard deviation can be found by taking the square root of the variance. Therefore, the portfolio standard deviation is 16.6% (√(0.5²*0.06 + 0.5²*0.05 + 2*0.5*0.5*0.4*0.0224*0.0245)). Standard deviation is calculated, much like expected return, to judge the realized performance of a portfolio manager.
7154
['Calculate the mean.', 'Subtract the mean from each observation.', 'Square each of the resulting observations.', 'Add these squared results together.', 'Divide this total by the number of observations (variance, S2).', 'Use the positive square root (standard deviation, S).']
38416
['First, take the square of the difference between each data point and the sample mean, finding the sum of those values.', 'Then, divide that sum by the sample size minus one, which is the variance.', 'Finally, take the square root of the variance to get the SD.']
1005306
['Step 1: Enter your data into the calculator. This will be the first step for any calculations on data using your calculator. ... ', 'Step 2: Calculate 1-Variable Statistics. ... ', 'Step 3: Select the correct standard deviation.']
268804
By definition, variance and standard deviation are both measures of variation for interval-ratio variables. They describe how much variation or diversity there is in a distribution. ... To calculate the variance, you first subtract the mean from each number and then square the results to find the squared differences.
273084
To figure out the variance, divide the sum, 82.5, by N-1, which is the sample size (in this case 10) minus 1. The result is a variance of 82.5/9 = 9.17. Standard deviation is the square root of the variance so that the standard deviation would be about 3.03.
431173
Find the standard deviation of all the x-values (call it sx) and the standard deviation of all the y-values (call it sy). Add up the n results from Step 3. Divide the sum by sx ∗ sy. Divide the result by n – 1, where n is the number of (x, y) pairs.
226931
Standard deviation is calculated as: The mean value is calculated by adding all the data points and dividing by the number of data points. The variance for each data point is calculated, first by subtracting the value of the data point from the mean.
1096880
['Summary. ... ', 'Get the standard deviation in a sample.', 'Estimated standard deviation.', '=STDEV (number1, [number2], ...)', 'number1 - First number or reference in the sample. ... ', 'The STDEV function calculates the standard deviation for a sample set of data.']
222135
The variance is the average of the squared deviations from the mean, i.e., var = mean(abs(x - x. mean())**2) . The mean is normally calculated as x. sum() / N , where N = len(x) .
963714
['Calculate the mean of your data set.', 'Subtract that mean from each of the scores in your data set to determine the individual deviation of each score from the mean.', 'Square each of those individual deviations.', 'Sum all of the squared deviations.', 'Divide that sum by one less than the sample size (N–1)']
464709
['Calculate the deviation of each measurement. ... ', 'Calculate the squares of each of the deviations (i.e. di2). ... ', 'Add together all the squares of the deviations i.e.', 'Divide by the total number of measurements (i.e. n) to obtain the mean of all the square deviations.']
23311
['Work out the mean.', 'Then for each number: subtract the Mean and square the result.', 'Then work out the mean of those squared differences. To work out the mean, add up all the values then divide by how many. But hang on ... ... ', 'Take the square root of that:']