# How to calculate standard deviation of demand

**Standard Deviation in Excel (NEW VERSION IN DESCRIPTION)**

The most common standard deviation associated with a stock is the standard deviation of daily log returns assuming zero mean. To compute this you average the.

May 28, · 2 Answers. Sorted by: 1. For your n = days, I got a sample mean of X ¯ =, and sample standard deviation s = For what it's worth, A = X ¯ + 2 s = and B .

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