March 28, 2017

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Drivers pay an average of (mean $690) per year for automobile insurance the distribution of insurance payments is approximately normal with a standard deviation of 110 dollars. What proportion of drivers pay more than 100 dollars per year for insurance?

  • statistics - ,

    Use z-scores.

    z = (x - mean)/sd

    x = 100
    mean = 690
    sd = 110

    Plug the values into the formula, then use a z-table to determine the proportion.

    I hope this will help get you started.

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