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1 The average life of a bread machine is 7 years, with a standard deviation of 1 year. Assuming that the life of these machines

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1 The average life of a bread machine is 7 years, with a standard deviation of 1 year. Assuming that the life of these machines follows approximately a normal distribution, what is the probability that the mean life of a random sample of 9 of these machines falls between 6.4 and 7.2 years?

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