Workers at a large toxic cleanup project are concerned that their white blood cell counts may have been reduced. Let x be 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 = 6820. (b) Compute  P(x ≤ 6820).  (Round your answer to four decimal places.)  =

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