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  3. the average repair cost of a microwave oven is $55

The average repair cost of a microwave oven is $55, with a standard deviation of...

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The average repair cost of a microwave oven is $55, with a standard deviation of $8. The costs are normally distributed. If 12 (sample) ovens are repaired, find the probability that the mean of the repair bills will be greater than $60..4985.9845.243.015

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