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What is the z-value for an adult who sleeps eight hours

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Question: The results of a national survey showed that on average, adults sleep 6.9 hours per night. Suppose that the standard deviation is 1.2 hours and that the number of hours of sleep follows a bell-shaped distribution.

a. Use the empirical rule to calculate the percentage of individuals who sleep between 4.5 and 9.3 hours per day.

b. What is the z-value for an adult who sleeps 8 hours per night?

c. What is the z-value for an adult who sleeps 6 hours per night?

Reference no: EM131668350

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