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how to calculate mean and standard deviation

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Given the holding-period returns shown here, compute the average returns and the standard deviation for Supply Chain Inc. and Wholesale Importers, Inc.

Month Supply Chain Inc. Wholesale Importers
1 6% 4%
2 3 2
3 -1 1
4 -3 -2
5 5 2
6 0 2

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Solution Summary

The following provides all formulas and demonstrates how mean and standard deviation are calculated from a set of data. Results are also calculated in Excel.

Solution Preview

In Excel,
STDEV uses the following formula:

In words, we are squaring the deviations of the x's from ...

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