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Irish people are increasingly skimping on their sleep. A health expert believes that Irish adults sleep an average of 6.2 hours on weekdays, with a

Irish people are increasingly skimping on their sleep. A health expert believes that Irish adults sleep an average of 6.2 hours on weekdays, with a standard deviation of 1.2 hours. Assume that sleep time on weekdays is normally distributed. What percentage of Irish adults sleep between 6 and 9 hours on weekdays?

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