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A. The amount of time required for an oil and filter change on an automobile is...

A. The amount of time required for an oil and filter change on an automobile is normally distributed with a mean of 45 minutes and a standard deviation of 10 minutes. A random sample of 16 cars is selected. 95% of all sample means will fall between what two values?

B. Salmon weights are bell-shaped, with a mean of 12.3 pounds and standard deviation of 2 pounds. According to the Empirical Rule, approximately 95% of all salmon weigh between what two values?

Math   Statistics-And-Probability   
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Answer #1

(A)

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(b)

Ans : 8.3 and 16.3

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