The diameter of a brand of tennis balls is approximately normally distributed, with a mean of 2.63 inches and a population standard deviation of .03 inch. If you select a random sample of 9 tennis balls,  (d) Between what two values symmetrically distributed around the mean are 60% of the values? (e) Given a random sample of 64 tennis balls, what is the probability that the sample mean is less than 2.61 inches? (f) Explain the difference in the results of (b) and (e).

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