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## Homework Statement

In a recent survey, 80% of the community favored building a police substation in their neighborhood. If 15 citizen are chosen, what is the standard deviation of the number favoring the substation?:yuck:

## Homework Equations

I know that my mean is 15 and the probiblilty is 80 but how do I get the standard deviation.

## The Attempt at a Solution

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