The results of a national survey showed that on average, adults sleep 6.9 hours per night. Suppose
Question:
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?
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a According to the empirical rule approximately 95 of data values ...View the full answer
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Related Book For 
Essentials of Business Analytics
ISBN: 978-1285187273
1st edition
Authors: Jeffrey Camm, James Cochran, Michael Fry, Jeffrey Ohlmann, David Anderson, Dennis Sweeney, Thomas Williams
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