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[All Steps] A department store has determined that 25% of all their sales are credit sales. A random sample of 75 sales is selected. What are the expected

Question: A department store has determined that 25% of all their sales are credit sales. A random sample of 75 sales is selected.

  1. What are the expected value, standard deviation, and shape of the sampling distribution?
  2. What is the probability that the sample proportion will be between 0.196 and 0.354?
  3. What is the probability that the sample proportion will be less than 0.10?

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