Statistics

there is a 1/5 (.20) probability that one type of appliance will break with in two years. find the probability that 4 out 15 such appliances willl break within that time period

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  1. Try the binomial probability formula:

    P(x) = (nCx)(p^x)[q^(n-x)]

    n = 15
    x = 4
    p = .20
    q = 1 - p = .80

    Substitute the values into the formula and calculate your probability.

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