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A market research firm conducts telephone surveys with a 40% historical response rate. What is the probability that in a new sample of 400 telephone

  1. A market research firm conducts telephone surveys with a 40% historical response rate. What is the probability that in a new sample of 400 telephone numbers, at least 150 indi- viduals will cooperate and respond to the questions? In other words, what is the probabil- ity that the sample proportion will be at least 150/400 = .375?

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