Thelifetimes of light bulbs of a particular type are normally distributed with amean of 370 hours and a standard deviation of 5 hours. What percentage of bulbshas lifetimes that lie within 1 standard deviation of the mean on either side? Theamount of Jen’s monthly phone bill is normally distributed with a mean of $60and a standard deviation of $12. Fill inthe blanks:68% of her phone bills are between$______________ and $______________.
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