The times per week a student uses a lab computer are normally distributed, with a mean of 5.9 hours and a standard deviation of 1.5 hours. A student is randomly selected. Find the following probabilities.

(a) The probability that a student uses a lab computer less than 3 hours per week is?

b)The probability that a student uses a lab computer between 5 and 8 hours per week is

c)The probability that a student uses a lab computer more than 9 hours per week is