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The number of hours that college students sleep on a week night is approximated by a normal curve with a mean of 7 hours and a standard deviation of 1.7 hours. Answer the question below using a z table:

About what proportion of students sleep less than 5 hours on a week night? (round to whole number)


About 16%


About 24%


About 12%


About 32%

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  1. Z = (score-mean)/SD

    Use the Z table.

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  2. yes

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  3. About 32%

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