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The lengths of lumber a machine cuts are normally distributed with a mean of 101 inches and a standard deviation of 0.7 inch (a) What

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The lengths of lumber a machine cuts are normally distributed with a mean of 101 inches and a standard deviation of 0.7 inch (a) What is the probability that a randomly selected board cut by the machine has a longth greater than 101 23 inches? (b) A sample of 39 boards is randomly selected. What is the probability that their mean length is greater than 101.23 inches

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