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The probability that a person has immunity to a particular disease is 0.6. Find the mean number who have

immunity in samples of size 12.

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  1. 16 June, 15:36
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    Step-by-step explanation:

    This is a binomial probability problem. There are only two outcomes. It is either a chosen person has immunity to a particular disease or he does not. The probability of success in this case, p is the probability that a chosen person has immunity to a particular disease. Thus

    p = 0.6

    The probability of failure, q is q = 1 - p

    Thus, q = 1 - 0.6 = 0.4

    Mean = np

    Where n represents sample size. Thus,

    Mean = 12 * 0.6 = 7.2
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