six hundred adult americans were asked by telephone poll, "what do you think constitutes a middle-class income?" Include left endpoint, but not right endpoint. salary: R. Freq. < 20000 0.02 20000-25000 0.09 25000-30000 0.19 30000-40000 0.26 40000-50000 0.18 50000-75000 0.17 75000-99999 0.02 100000+ 0.01 A. what percentage if the survey answered not sure B. What percentage think that middle-class is from $25,000 to $50,000? C. D. Find the 40th and 80th percentiles
six hundred adult americans were asked by telephone poll, "what do you think constitutes a middle-class income?" Include left endpoint, but not right endpoint.
salary: R. Freq.
< 20000 0.02
20000-25000 0.09
25000-30000 0.19
30000-40000 0.26
40000-50000 0.18
50000-75000 0.17
75000-99999 0.02
100000+ 0.01
A. what percentage if the survey answered not sure
B. What percentage think that middle-class is from $25,000 to $50,000?
C.
D. Find the 40th and 80th percentiles
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