Mathematics, 05.05.2020 07:33 kvngnick

The average life of a bread-making machine is 7 years, with a standard deviation of 1 year. Assuming that the lives of these machines follow approximately a normal distribution, find the probability that the mean life of a random sample of 9 such machines falls between 6.4 and 7.2 years.

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The average life of a bread-making machine is 7 years, with a standard deviation of 1 year. Assuming...

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