Posted by **jonathan** on Friday, November 30, 2012 at 4:53pm.

The time per week a student uses a lab computer is normally distributed, with a mean of 6.2 hours and a standard deviation of 0.9 hour. A student is randomly selected.

a. Find the probability that a student uses a lab computer less than 4 hours per week.

b. Find the probability that a student uses a lab computer between 5 and 7 hours per week.

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