The costomer service center in a large new york department store has determined that the ammount of time spent with a costomer is normally distributed, with a mean of 9.3 minutes and a standard deviation of 2.5 minutes. What is the probability the ammount of time spent resolving a complaint will be:  a. less than 10 minutes b. longer thsn 5 minutes c. between 8 and 5 minutes

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