Workers at a large toxic cleanup project are concerned that their white blood cell counts may have been reduced. Letxbe a random variable that represents white blood cell count per cubic millimeter of whole blood in a healthy adult. Then μ = 7500 and σ ≈ 1750.†
A random sample of n = 50 workers from the toxic cleanup site were given a blood test that showed x = 6750. What is the probability that, for healthy adults ,x will be this low or lower?
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