What is the probability of x-bar < 5000, Basic Statistics

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What is the probability of x-bar < 5000

Let x be random variable that represents white blood cell count per cubic milliliter of a whole blood. Assume that x has a distribution that's approx. normal w/mean mu=7500 and estimated standard deviation sigma=1750.

Suppose that a Dr. uses the average x-bar for TWO tests taken about a week apart. What is the probability of x-bar < 5000?

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Basic Statistics: What is the probability of x-bar < 5000

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