Question

1) 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 = 6760. Compute P(x ≤ 6760). (Round your answer to four decimal places.)

2) Do you have a great deal of confidence in the advice given to you by your medical doctor? About 25% of all adult Americans claim they do have a great deal of confidence in their M.D.s. Suppose a random sample of n = 33 adults in a health insurance program are asked about their confidence in the medical advice their doctors give. Find the value of.σp̂. (Round your answer for σp̂ to three decimal places.)

3)Suppose x has a distribution with μ = 31 and σ = 12. f random samples of size n = 16 are selected, If the original x distribution Suppose x has a distribution with μ = 31 and σ = 12. a) If random samples of size n = 16 are selected. Find P(27 ≤ x ≤ 32). (Round your answer to four decimal places.)

Answer 1

1)

Here,

Required probability =