Six hundred adult Americans were asked by telephone poll, "What do you think constitutes a middle-class income?" The results are below. Also, include left endpoint, but not the right endpoint. Salary ($) Relative Frequency < 20,000 0.02 20,000-25,000 0.09 25,000-30,000 0.19 30,000-40,000 0.26 40,000-50,000 0.18 50,000-75,000 0.17 75,000-99,999 0.02 100,000+ 0.01 a. What proportion of the respondents answered "not sure"? b. What proportion think that middle-class is from $25,000 to $50,000?

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Six hundred adult Americans were asked by telephone poll, "What do you think constitutes a
middle-class income?" The results are below. Also, include left endpoint, but not the right
endpoint.
Salary ($) Relative Frequency
< 20,000
0.02
20,000-25,000
0.09
25,000-30,000
0.19
30,000-40,000
0.26
40,000-50,000
0.18
50,000-75,000
0.17
75,000-99,999
0.02
100,000+
0.01
a.
What proportion of the respondents answered "not sure"?
b.
What proportion think that middle-class is from $25,000 to $50,000?
Transcribed Image Text:Six hundred adult Americans were asked by telephone poll, "What do you think constitutes a middle-class income?" The results are below. Also, include left endpoint, but not the right endpoint. Salary ($) Relative Frequency < 20,000 0.02 20,000-25,000 0.09 25,000-30,000 0.19 30,000-40,000 0.26 40,000-50,000 0.18 50,000-75,000 0.17 75,000-99,999 0.02 100,000+ 0.01 a. What proportion of the respondents answered "not sure"? b. What proportion think that middle-class is from $25,000 to $50,000?
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