Grouped Data: Hours of Sleep per Day Alexander Borbely is a professor at the University of Zurich Medical School, where he is director of the sleep laboratory. The histogram in Figure 3-5 is based

on information from his book Secrets of Sleep. The histogram displays hours of sleep per day for a random sample of 200 subjects. Estimate the mean hours of sleep, standard deviation of hours of sleep, and coefficient of variation.AppendixLO1

Transcribed Image Text:

90 FIGURE 3-5 Hours of Sleep Each Day (24-hour period) Frequency 90 80 70 60 50 40 30 64 20 0 10 22 22 14 Hours of sleep 2 4 2 2 + + + + + 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5