7.30 According to Gallup’s poll on personal finances, 46% of U. S. workers say they feel that they will have enough money to live comfortably

7.30 According to Gallup’s poll on personal finances, 46% of U. S. workers say they feel that they will have enough money to live comfortably when they retire. (Data extracted from The Gallup Poll, www.gallup.com. May 6, 2008.) If you select a random sample of 200 U.S. workers, a. what is the probability that the sample will have between 45% and 55% who say they feel they will have enough money to live comfortably when they retire? b. the probability is 90% that the sample percentage will be contained within what symmetrical limits of the population percentage? c. the probability is 95% that the sample percentage will be contained within what symmetrical limits of the population percentage?

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