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What's the 40% out and what's the 80% tile

What's the 40% out and what's the 80% tile

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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What's the 40% out and what's the 80% tile

CO Six hundred adult Americans were asked by telephone poll, "What do you think constitutes a middle-class income?" The results are in Table 2.71. Also, include left endpoint, but not the right endpoint. 2 3 Relative 4. Salary ($) < 20,000 frequency 0.02 20,000-25,000 0.09 25,000-30,000 0.19 8 30,000-40,000 0.26 9. 40,000-50,000 0.18 10 50,000-75,000 0.17 11 75,000-99,999 0.02 12 100,000+ 0.01 13 a. What percentage of the survey answered "not sure"? b. What percentage think that middle-class is from $25,000 to $50,000? c. If you constructed a histogram of the data. (Note: you do not actually have to make a histogram) I. Should all bars have the same width, based on the data? Why or why not? 14 15 16 17 18 ii. How should the <20,000 and the 100,000+ intervals be handled? Why? 19 d. Find the 40th percentile e. Find the 80th percentile 20
Transcribed Image Text:CO Six hundred adult Americans were asked by telephone poll, "What do you think constitutes a middle-class income?" The results are in Table 2.71. Also, include left endpoint, but not the right endpoint. 2 3 Relative 4. Salary ($) < 20,000 frequency 0.02 20,000-25,000 0.09 25,000-30,000 0.19 8 30,000-40,000 0.26 9. 40,000-50,000 0.18 10 50,000-75,000 0.17 11 75,000-99,999 0.02 12 100,000+ 0.01 13 a. What percentage of the survey answered "not sure"? b. What percentage think that middle-class is from $25,000 to $50,000? c. If you constructed a histogram of the data. (Note: you do not actually have to make a histogram) I. Should all bars have the same width, based on the data? Why or why not? 14 15 16 17 18 ii. How should the <20,000 and the 100,000+ intervals be handled? Why? 19 d. Find the 40th percentile e. Find the 80th percentile 20
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