statistics

In the U.S. 42% of the population has type A blood. Consider taking a sample size 4. Let y denote the number of persons in the sample with type A blood.

a)Pr(y=O)
b)Pr(y=1)
C)Pr(y=2)

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  1. p(A) = .42
    1-p(A) = .58
    n = 4
    for n = 4, binomial coefs are
    1 4 6 4 1

    P(y=0) = 1*.42^0*.58^4
    P(y=1) = 4*.42^1*.58^3
    P(y=2) = 6*.42^2*.58^2

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