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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 2.73 inches and a standard deviation of 0.03 inch. A random sample of 12 tennis balls is selected. Complete parts (a) through (d) below

What is the probability that the sample mean is between 2.72 and 2.74 inches?

The probability is 71​% that the sample mean will be between what two values symmetrically distributed around the population​ mean?

Math   Statistics-And-Probability   
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