The healing time for a certain type of incision is normally distributed with a mean of 240 hours and a standard deviation of 20 hours

a) what is he probability that the healing time for a randomly selected patient will exceed 255 hrs?

b) what is the probability that the healing time for a randomly selected patient will be exactly 240 hours

c) 90% of persons with this type of incision will require less than what amount of time to heal?

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