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3. A carload of steel rods has arrived at Cybermatic Construction Company. The car contains 300 rods. Claude Org, manager of Quality Assurance, directs his

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3. A carload of steel rods has arrived at Cybermatic Construction Company. The car contains 300 rods. Claude Org, manager of Quality Assurance, directs his crew measure the lengths of 90 randomly selected rods. If the population of rods have a mean length of 78 inches and a standard deviation of 2 inch, the probability that Claude's sample has a mean greater than 81 inches is

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