Another common statistical measure is the standard deviation, which provides an indication of how the indivdual values in the distribution differ from the mean. to calculate the standard dev. whose element are x1, x2.....xn you need to perform the ff steps
a. calculate the mean of the distribution
b. go thr0ugh the individual data items in the distribution and calculate the square of the difference between each data value and the mean. add all these values to a running total.
c. take the total from step b and divide it by the number of data items
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