statistics

If 80% of the applicants are able to pass a driver's proficiency road test, find the mean, variance, and standard deviation of the number of people who pass the test in a sample of 300 applicants.

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  1. Your values are the following:
    p = .8, q = 1 - p = .2, and n = 300

    Therefore:
    mean = np = (300)(.8) = ?
    variance = npq = (300)(.8)(.2)= ?
    standard deviation = square root of the variance

    I'll let you take it from here.

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