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Today, 09:06

Suppose commute times in a large city are normally distributed and that 62.50% of commuters in this city take more than 21 minutes to commute one-way. if the standard deviation of such commutes is 6.2 minutes, what is the mean commute?

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  1. Today, 09:11
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    If 62.5% take more than 21 minutes

    37.5% take less than 21 minutes

    convert. 375 to a zscore using the normal distribution chart in your book

    P (.375) = z - 0.318639364

    (21 - x) / 6.2 = - 0.318639364

    (21 - x) = - 1.9755640568

    22.9755640568 = x

    mean commute is 22.98 minutes
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