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The piston rings are used to reject when a certain dimension is not within the specifications...

The piston rings are used to reject when a certain dimension is not within the specifications 1.5±d. It is known that this measurement is normally distributed with mean 1.50 mm and standard deviation 0.20 mm.

(4). Find the value d such that the specifications cover 90% of the measurements.

(5). What is the probability that the measurement of a selected piston ring will be more than 3 mm?

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