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What is the formula for finding the standard deviation?

Standard Deviation Formula. Standard deviation (σ) is the measure of spread of numbers from the mean value in a given set of data. Sample SD formula is S = √∑ (X - M)2 / n - 1. Population SD formula is S = √∑ (X - M)2 / n. Mean(M) can be calculated by adding the X values divide by the Number of values (N).

How to calculate a maximum standard deviation?

Find the mean To find the mean, add up all the scores, then divide them by the number of scores. ... Find each score's deviation from the mean Subtract the mean from each score to get the deviations from the mean. ... Square each deviation from the mean Multiply each deviation from the mean by itself. ... More items...

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