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Compute Standard Deviation from a frequency table

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X P(X=x)

(5 @ .12)
(6 @ .24)
(8 @ .44)
(10 @ .20)

What is the standard deviation of X?

Solution Summary

A step-by-step solution shows the student how to calculate the standard deviation given a probability distribution.

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So, standard deviation is computed as follows...

sqrt[E(x^2)-(Ex)^2]

So to find E(x) (the mean) we ...

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