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The length of life of an instrument produced by a machine has a normal distribution with a mean of 12 months and standard deviation of

The length of life of an instrument produced by a machine has a normal distribution with a mean of 12 months and standard deviation of 2 months.We are interested in the average length of life of 100 randomly selected instruments of this type. What is the probability that the average will be more than 12.2 months?

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