Police response time to an emergency call is the difference between the time the call is first

Question:

Police response time to an emergency call is the difference between the time the call is first received by the dispatcher and the time a patrol car radios that it has arrived at the scene (based on information from The Denver Post). Over a long period of time, it has been determined that the police response time has a normal with a mean of 8.4 minutes and a standard deviation of 1.7 minutes. For a randomly received emergency call, what is the probability that the response time will be:
(a) Between 5 and 10 minutes?
(b) Less than 5 minutes?
(c) More than 10 minutes?
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