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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 1.4 hours. A student is randomly selected. Find the following probabilities. ​(a) Find the probability that the student uses a lab computer less than 3 hours per week. ​(b) Find the probability that the student uses a lab computer between 7 and 8 hours per week. ​(c) Find the probability that the student uses a lab computer more than 9 hours per week.

math   Statistics-And-Probability   
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