The sales record of a real estate company for the

19. The sales record of a real estate company for the month of May shows the following house prices
(rounded to the nearest $1,000). Values are in thousands of dollars.
105 55 45 85 75
30 60 75 79 95
a. Develop a frequency distribution and a percent frequency distribution for the house prices.
(Use 5 classes and have your first class be 20 - 39.)
b. Develop a cumulative frequency and a cumulative percent frequency distribution for the
above data.

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c. What percentage of the houses sold at a price below $80,000?
ANS:
a. a. b. b.
Cum.
Sales Price Percent Cum. Percent
(In Thousands of Dollars) Freq. Freq. Freq. Freq.
20 - 39 1 10 1 10
40 - 59 2 20 3 30
60 - 79 4 40 7 70
80 - 99 2 20 9 90
100 - 119 1 10 10 100
c. 70%
PTS: 1 TOP: Descriptive Statistics
20.
The test scores of 14 individuals on their first statistics examination are shown below.
95 87 52 43 77 84 78
75 63 92 81 83 91 88
Construct a stem-and-leaf display for these data.
PTS: 1 TOP: Descriptive Statistics
21. A survey of 400 college seniors resulted in the following crosstabulation regarding their undergraduate
major and whether or not they plan to go to graduate school.
Undergraduate Major
Graduate School Business Engineering Others Total
Yes 35 42 63 140
No 91 104 65 260
Total 126 146 128 400
ANS:

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a. No, majority (260) will not attend graduate school
b. Majority (146) are engineering majors
c.
Undergraduate Major
Graduate School Business Engineering Others Total
Yes 25% 30% 45% 100%
No 35% 40% 25% 100%
Majority who plan to go to graduate school are from "Other" majors. Majority of those who will
not go to graduate school are engineering majors.
d.
Undergraduate Major
Graduate School Business Engineering Others
Yes 27.8% 28.8% 49.2%
No 72.2% 71.2% 50.8%
Total 100% 100% 100%
Approximately the same percentages of Business and engineering majors plan to attend graduate
school (27.8% and 28.8% respectively). Of the "Other" majors approximately half (49.2%) plan
to go to graduate school.
PTS: 1 TOP: Descriptive Statistics