Essentials of Business Analytics (MindTap Course List)
Essentials of Business Analytics (MindTap Course List)
2nd Edition
ISBN: 9781305627734
Author: Jeffrey D. Camm, James J. Cochran, Michael J. Fry, Jeffrey W. Ohlmann, David R. Anderson
Publisher: Cengage Learning
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Chapter 2, Problem 22P

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.

  1. a. Use the empirical rule to calculate the percentage of individuals who sleep between 4.5 and 9.3 hours per day.
  2. b. What is the z-value for an adult who sleeps 8 hours per night?
  3. c. What is the z-value for an adult who sleeps 6 hours per night?
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Essentials of Business Analytics (MindTap Course List)

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