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Card 9 / 15:
Six hundred adult Americans were asked by telephone poll, "What do you think constitutes a middle-class income?" The results are in . Also, include left endpoint, but not the right endpoint.
What percentage of the survey answered "not sure"?What percentage think that middle-class is from $25,000 to $50,000?Construct a histogram of the data. Should all bars have the same width, based on the data? Why or why not? How should the < 20,000 and the 100,000+ intervals be handled? Why?Find the 40 th and 80 th percentilesConstruct a bar graph of the data
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