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 samp

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?