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9. Suppose that 47% of Americans are iPhone users. (a) If a random sample of 100 Americans are surveyed, what is the probability that the

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9. Suppose that 47% of Americans are iPhone users. (a) If a random sample of 100 Americans are surveyed, what is the probability that the proportion of the sample who are iPhone users is between 45% and 50%? (b) If a random sample of 50 Americans are surveyed, what is the probability that more than 50% of Americans are iPhone users

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