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What percent of american adults sleep more than 8 hours on

Americans are increasingly skimping on their sleep (National Geographic News, February 24, 2005). A health expert believes that American adults sleep on 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.

What percent of American adults sleep more than 8 hours on weekdays?
What percent of American adults sleep less than 6 hours on weekdays?
What percent of American adults sleep between 6 to 8 hours on weekdays?

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