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How to get the standard deviation

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Reference no: EM132024828

Suppose the probability of someone wearing a pair of glasses among 5th graders is 39.3%. If there are 52 kids in a class, what will be the standard deviation of this distribution?

Not sure how to get the standard deviation, but I think the variance should be:

Sum of (x-mean)^2/n

But I'm not sure where where the probability should go. X?

Or should I use more of an expected value equation like:

Sum(x-mean)^2*Probability(X)

Please help me understand the process on how to calculate these.

Reference no: EM132024828

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