Americans are increasingly skimping on their sleep National Geographic News
Americans are increasingly skimping on their sleep (National Geographic News, February 24, 2005). A health expert believes that American adults sleep an average of 6.2 hours on weekdays with a standard deviation of 1.2 hours. Toanswer the following questions, assume that sleep time on weekdays is normally distributed.
a. What percentage of American adults sleep more than
8 hours on weekdays?
b. What percentage of American adults sleep less than 6 hours on weekdays?
c. What percentage of American adults sleep between 6 and 8 hours on weekdays?

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