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The yield of a type of support bar has a normal distribution with mean 18.6 and...

The yield of a type of support bar has a normal distribution with mean 18.6 and a standard deviation of 5.9. Take a simple random sample of 50 support bars. What is the probability that the mean yield 21 or less?

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Answer #1

We want the probability that the mean yield 21 or less. So we have directly find the probability of less than 22.

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