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A study has shown that among people without any preschool education, 32% were employed at age 19. If 100 people without preschool education are selected, find the probability that 40 or fewer are employed.


    Find z.

    z = (x - mean)sd

    mean = np
    sd = √npq

    n = 100
    p = .32
    q = 1 - p = .68

    Substitute 40 for x in the formula. Calculate mean and standard deviation. Plug in the other values. Find z, then check z-table for your probability.

    I hope this will help get you started.

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