Calculation of standard deviation - discrete series, Operation Research

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Calculation of Standard Deviation - Discrete Series

There are three methods for calculating standard deviation in discrete series":

a.Actual Mean Methods: It include the following steps

1.Calculate the mean of the series.

2.Find deviations for various items from the mean i ,e, X- s

3.Square the deviations d2 and multiply by the respective frequencies(f) we get fd2.

4. Total the product ( ∑fd2). The apply the formula.

= √∑fd2/ ∑f

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