(Answered) The diameter of a brand of ping-pong ball is approximately

Statistics

The diameter of a brand of ping-pong ball is approximately normally distributed, with a mean of 1.30 inches and a standard deviation of 0.04 inch. If you select a random sample of 16 ping-pong balls,

(a) What is the sampling distribution of the mean?

(b) What is the probability that the sample mean is less than 1.28 inches?

(d) The probability is 60% that the sample mean is between will be between what two values, symmetrically distributed around the population mean?

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