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7 July, 20:56

According to insurance records, a car with a certain protection system will be recovered 85% of the time. If 100 stolen cars are randomly selected, what is the mean and standard deviation of the number of cars recovered after being stolen?

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  1. 7 July, 21:29
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    Write 85% as a decimal: 0.85

    To find the mean, multiply the sample by the percentage:

    Mean = 100 x 0.85 = 85

    The standard deviation formula: √n*p * (1-p)

    n = sample

    p = percentage

    Standard deviation = √ (100 * 0.85 * (1-0.85)

    Standard deviation = 3.57
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