A health expert evaluates the sleeping patterns of adults. Each week she randomly selects 40 adults and

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A health expert evaluates the sleeping patterns of adults. Each week she randomly selects 40 adults and calculates their average sleep time. Over many weeks, she finds that 5% of average sleep time is less than 6 hours and 5% of average sleep time is more than 6.4 hours. What are the mean and standard deviation (in hours) of sleep time for the population?

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