Alexander Borbély is a professor at the University of Zurich Medical School, where he is the director of the sleep laboratory. The histogram in Figure 3-2 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.
Hours of Sleep Each Day (24-hour Period)

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90 2 90 80 70 60 50 40 30 20 10 64 14 2 2 3.5 4.5 5.5 6.5 75 8.5 9.5 10.5 Hours of sieep