Thelifetimes of light bulbs of a particular type are normall

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 $______________.