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The diameter of a brand of tennis balls is approximately normally​ distributed, with a mean of...

The diameter of a brand of tennis balls is approximately normally​ distributed, with a mean of 2.57 inches and a standard deviation of 0.05 inch. A random sample of 10 tennis balls is selected.

What is the probability that the sample mean is less than 2.56 inches?= 0.2643

What is the probability that the sample mean is between 2.55 and 2.58 inches?= 0.6319

The probability is 65% that the sample mean will be between what two values symmetrically distributed around the population​ mean?

The lower bound is ? inches. The upper bound is ? inches.

Math   Statistics-And-Probability   
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