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5) As a result of tests of 20000 electric motors manufactured by a company, it was found that the lifetime of the motors was normally

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5) As a result of tests of 20000 electric motors manufactured by a company, it was found that the lifetime of the motors was normally distributed, with an average life of 2040 hours and standard deviation of 60 hours. On the basis of the information, estimate the number of motors that are expected to work between a. 1960 and 2040 hours b. 2040 and 2150 hours

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