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7 December, 15:51

Suppose that 50% of all college students smoke cigarettes. a sample of 14 is selected randomly. what is the probability that less than 13 students smoke?

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  1. 7 December, 16:53
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    X~B (14, 0.5)

    n = 13

    P (X < 13) = 14C13 x 0.5^13 x 0.5

    = 0.00085

    = 8.5 x 10^-4

    Answer is 8.5 x 10^-4
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