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1 December, 17:32

The rhythm method of contraception is rated as 60% effective. Find the probability that it will be effective in each of five (5 out of 5) separate trials.

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  1. 1 December, 20:06
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    P (5R) = 0.60^5

    P (5R) = 0.07776 = 0.078

    Therefore the probability that it will be effective in each of five (5 out of 5) separate trials is 0.078

    Step-by-step explanation:

    Given;

    The probability that the rhythm method of contraception is effective once is P (R) = 0.60

    The probability that it will be effective n times is;

    P (nR) = 0.60^n

    For this case n = 5

    P (5R) = 0.60^5

    P (5R) = 0.07776

    P (5R) = 0.078
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