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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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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 $______________.

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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,
? = ...

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