Fiona walks from her house to a bus stop where she gets a bus to school. Her time, W minutes, to walk to the bus stop is normally distributed with W-N (12,3^2).  Fiona always leaves her house at 07:15. The first bus that she can get departs at 07:30. a) Find the probability that it will take Fiona between 15 minutes and 30 minutes to walk to the bus stop.

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