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Question
The population of lengths of aluminum-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.3 inches. What is the probability that the average length of a steel sheet from a sample of 9 units is more than 29.95 inches long?A. .4602
B. .8413
C. .1587
D. .5397
Answer
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An chart is a control chart on which individual process measurements are plotted versus time.
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