USA Today reported that about 20% of all people in the United States are illiterate. Suppose you
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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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a n 7 p 020 b np 7020 14 We expect 14 people to be illiterate c L...View the full answer
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Related Book For 
Understandable Statistics Concepts And Methods
ISBN: 9781337119917
12th Edition
Authors: Charles Henry Brase, Corrinne Pellillo Brase
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