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The time required in a laboratory to test a blood sample is approximately normally distributed, with mean =25 minutes and standard deviation ?=3 minutes. Now

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The time required in a laboratory to test a blood sample is approximately normally distributed, with mean =25 minutes and standard deviation ?=3 minutes. Now suppose 50 samples are taken. What is the probability that the average time for testing the 50 samples will be less than 26 minutes?

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