how to calculate standard deviation in xls?
['Calculate the mean (μ).', 'For each number, calculate the distance to the mean.', 'For each number, square this distance.', 'Sum (∑) these values.', 'Divide by the number of data points (N = 5).', 'Take the square root.', 'Fortunately, the STDEV. P function in Excel can execute all these steps for you.']