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The durations of professional men's volleyball matches are known to follow a normal distribution. It is calculated that, to estimate the true mean duration within

The durations of professional men's volleyball matches are known to follow a normal distribution. It is calculated that, to estimate the true mean duration within 9 minutes with 95% confidence, a sample of 100 matches is required. What sample size is required to estimate the true mean duration within 5 minutes with 95% confidence? A.256 B.196 C.100 D.200 E.324

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