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    68% of Jen's monthly phone bills are between ...

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    The amount of Jen's monthly phone bill is normally distributed with a mean of $60 and a standard deviation of $12. Fill in the blanks: 68% of her phone bills are between $______________ and $______________.

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    Solution Preview

    If we use the 68-95.99.7 rule, 68% of the values are within 1 standard deviation of the mean on each side. Therefore,
    ? = ...

    Solution Summary

    This solution calculates the answer to the following question:

    The amount of Jen's monthly phone bill is normally distributed with a mean of $60 and a standard deviation of $12. Fill in the blanks: 68% of her phone bills are between $______________ and $______________.

    $2.19

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