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The times per week a student uses a lab computer are normally​ distributed, with a mean...

The times per week a student uses a lab computer are normally​ distributed, with a mean of 6.2 hours and a standard deviation of 1.3 hours. A student is randomly selected. Find the following probabilities.

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

​(b) Find the probability that the student uses a lab computer between 6 and 8 hours per week.

​(c) Find the probability that the student uses a lab computer more than 9 hours per week.

(​Round answers to three decimal places as​ needed.)

Math   Statistics-And-Probability   
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