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Mean, standard deviation for number of left-handed people

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Ten percent of American adults are left-handed. Suppose we have a sample of 25 people. Assume that each person in the sample is either left or right-handed.

a) Find the mean and standard deviation for the number of left-handed people in the sample.

Mean= 2.5 standard deviation = 1.5

b) Would it be unusual to survey a group of 25 people and find that 7 of them are left-handed? Explain.

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The expert examines mean, standard deviation for numbers of left-handed people.

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a)

n = 25, p = 0.1, q = 1 - 0.1 = 0.9

Mean = np = 25*0.10 = ...

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