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Statistics: Probability and Deviation

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X has binomial distribution with parameters n = 20 and p = 0.1. Find the probability that X deviates from its mean by *less than or equal to* "k" multiples of its standard deviation for (a) k = 1, (b) k = 2.

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m = np = 2 and s = sqrt[np(1 - p)] ...

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