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Mechanical pencil lead is manufactured with a mean width of 0.9 mm. Because of variability in...

Mechanical pencil lead is manufactured with a mean width of 0.9 mm. Because of variability in the manufacturing process, the distribution of the width for pencil lead is approximately normal with a standard deviation of 0.004 mm. If any pencil lead thinner than 0.8938 mm is discarded, what proportion of pencil lead is NOT discarded? Round your answer to four decimal places.

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