ANSWERS: 1
  • Standard deviation is the square root of the statistical variance of a data set. If you want it calculated specifically, you'd need access to all of the data. First, you would calculate the mean as the average of all of the data. So, say you had three data points: 5, 6, 7. Calculate the mean as 5+6+7 / 3 = 6. Next, calculate the variance by taking the square of the difference between each data point and the mean, and then summing all of those and dividing by the number of data points. In this case (5-6)^2 = 1, (6-6)^2 = 0, and (7-6)^2 = 1. 1+0+1 / 3 = ~0.667. The standard deviation will be the square root of the statistical variance. So (0.667)^(1/2) = ~0.817. It'd be a lot more work to calculate with 50 points than with three, but, if you follow the process, it'd be a simple matter of performing the work on a calculator. If you have access to Google Sheets or MS Excel, you can calculate it easily there by typing the data into cells A1 through A50, and then selecting cell B1 and typing the formula " =stdev(A1:A50) " (without quotes).

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