Solve the problem.The lifespan for a pair of walking shoes is normally distributed with a mean of  steps and standard deviation of  steps. If a manufacture produces 6000 pairs of these shoes, how many can be expected to last for at least 756,000 steps?

A. ? 1313 pairs
B. ? 1271 pairs
C. ? 1205 pairs
D. ? 1391 pairs


Answer: B

Mathematics

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Mathematics