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g Suppose that the size of pebbles in a riverbed is normally distributed with a mean of 12 mm and a standard deviation of 2.5

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g Suppose that the size of pebbles in a riverbed is normally distributed with a mean of 12 mm and a standard deviation of 2.5 mm. P ( X 2 9 a) Find the probability that a randomly selected pebble in this riverbed has size less than 9 mm. (4 pts) P /XM

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