What percent of american adults sleep more

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Question: 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. To answer the following questions, assume that sleep time on weekdays is normally distributed.

a. What percent of American adults sleep more than 8 hours on weekdays?

b. What percent of American adults sleep less than 6 hours on weekdays?

c. What percent of American adults sleep between 6 to 8 hours on weekdays?

Reference no: EM131460628

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