Unknown to an experimenter, the corrosion rate of a certain type of chilled cast iron has a

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Unknown to an experimenter, the corrosion rate of a certain type of chilled cast iron has a standard deviation of 5.2. The experimenter measures the corrosion rates of 18 random samples of the chilled cast iron and estimates the mean corrosion rate. What is the probability that the experimenter's estimate will be more than 2 away from the correct value?
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