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A ferritin test is a popular test to measure a person's current iron stores. In women, ferritin is approximately normally distributed with a mean of

A ferritin test is a popular test to measure a person's current iron stores. In women, ferritin is approximately normally distributed with a mean of 89 ng/mL and a standard deviation of 23 ng/mL. If 50 women are tested, what is the probability that the mean ferritin exceeds 90?

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