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

Question

The times per week a student uses a lab computer are normally distributed, with a mean of 6.4 hours and a standard deviation of 1.2 hours. A student is randomly selected. Find the following probabilities. (a) Find the probability that the student uses a lab computer less than 5 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. a) The probability that a student uses a lab computer less than 5 hours per week is (Round to three decimal places as needed.) (b) The probability that a student uses a lab computer between 6 and 8 hours per week is (Round to three decimal places as needed.) (c) The probability that a student uses a lab computer more than 9 hours per week is (Round to tree decimal places as needed.)

Explanation / Answer

From statistical software output, the required probabilities are:

a) 0.122

b) 0.539

c) 0.015

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