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USA Today reported that about 20% of all people in the United States are illiterate. Suppose you interview seven people at random off a city street.
(a) Make a histogram showing the probability distribution of the number of illiterate people out of the seven people in the sample.
(b) Find the mean and standard deviation of this probability distribution. Find the expected number of people in this sample who are illiterate.
(c) How many people would you need to interview to be 98% sure that at least seven of these people can read and write (are not illiterate)? |
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