The diameter of Ping-Pong balls manufactured at a large factory is normally distributed with a mean of 1.30 inches and a standard deviation of 0.2 inch. If you select a random sample of 16 Ping-Pong balls, what is the probability that the sample mean diameter is less than 1.28 inches? 0.2514 0.0228 0.4602 0.3446 0.1587

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