STAT 200 SOLUTIONS MANUAL
CHAPTER 2: DESCRIPTIVE STATISTICS
Exercise The miles per gallon rating for 30 cars are shown below (lowest to highest).
1. 19, 19, 19, 20, 21, 21, 25, 25, 25, 26, 26, 28, 29, 31, 31, 32, 32, 33, 34, 35, 36, 37, 37,
38, 38, 38, 38, 41, 43, 43
Solution Stem Stem Leaf
1 999
2 0115556689
3 11223456778888
4 133
Table 1.84
Exercise The height in feet of 25 trees is shown below (lowest to highest).
2. 25, 27, 33, 34, 34, 34, 35, 37, 37, 38, 39, 39, 39, 40, 41, 45, 46, 47, 49, 50, 50, 53, 53,
54, 54
Solution Stem Stem Leaf
2 57
3 34445778999
4 015679
5 003344
Exercise The data are the prices of different laptops at an electronics store. Round each value
3. to the nearest ten. Create a stem plot using the hundreds digits as the stems and the
tens digits as the leaves.
249, 249, 260, 265, 265, 280, 299, 299, 309, 319, 325, 326, 350, 350, 350, 365, 369,
389, 409, 459, 489, 559, 569, 570, 610
,Solution Stem Stem Leaf
2 556778
3 001233555779
4 169
5 677
6 1
Table 1.85
Exercise The data are daily high temperatures in a town for one month.
4. 61, 61, 62, 64, 66, 67, 67, 67, 68, 69, 70, 70, 70, 71, 71, 72, 74, 74, 74, 75, 75, 75, 76,
76, 77, 78, 78, 79, 79, 95
For the next three exercises, use the data to construct a line graph.
Solution Stem Stem Leaf
6 1124677789
7 0001124445556678899
8
9 5
95 appears to be an outlier.
Exercise In a survey, 40 people were asked how many times they visited a store before making
5. a major purchase. The results are shown in Table 1.37.
Number of times in store Frequency Frequency
1 4
2 10
3 16
4 6
5 4
Table 1.37
,Solution
Exercise In a survey, several people were asked how many years it has been since they
6. purchased a mattress. The results are shown in Table 1.38
Years since last purchase Frequency
0 2
1 8
2 13
3 22
4 16
5 9
Table 1.38
Solution
, Exercise Several children were asked how many TV shows they watch each day. The results of
7. the survey are shown in Table 1.39.
Number of TV Shows Frequency
0 12
1 18
2 36
3 7
4 2
Table 1.39
Solution
Exercise The students in Ms. Ramirez’s math class have birthdays in each of the four seasons.
8. Table 1.40 shows the four seasons, the number of students who have birthdays in
each season, and the percentage (%) of students in each group. Construct a bar graph
showing the number of students.
Seasons Number of students Proportion of population
Spring 8 24%
Summer 9 26%
Autumn 11 32%
Winter 6 18%
Table 1.40
CHAPTER 2: DESCRIPTIVE STATISTICS
Exercise The miles per gallon rating for 30 cars are shown below (lowest to highest).
1. 19, 19, 19, 20, 21, 21, 25, 25, 25, 26, 26, 28, 29, 31, 31, 32, 32, 33, 34, 35, 36, 37, 37,
38, 38, 38, 38, 41, 43, 43
Solution Stem Stem Leaf
1 999
2 0115556689
3 11223456778888
4 133
Table 1.84
Exercise The height in feet of 25 trees is shown below (lowest to highest).
2. 25, 27, 33, 34, 34, 34, 35, 37, 37, 38, 39, 39, 39, 40, 41, 45, 46, 47, 49, 50, 50, 53, 53,
54, 54
Solution Stem Stem Leaf
2 57
3 34445778999
4 015679
5 003344
Exercise The data are the prices of different laptops at an electronics store. Round each value
3. to the nearest ten. Create a stem plot using the hundreds digits as the stems and the
tens digits as the leaves.
249, 249, 260, 265, 265, 280, 299, 299, 309, 319, 325, 326, 350, 350, 350, 365, 369,
389, 409, 459, 489, 559, 569, 570, 610
,Solution Stem Stem Leaf
2 556778
3 001233555779
4 169
5 677
6 1
Table 1.85
Exercise The data are daily high temperatures in a town for one month.
4. 61, 61, 62, 64, 66, 67, 67, 67, 68, 69, 70, 70, 70, 71, 71, 72, 74, 74, 74, 75, 75, 75, 76,
76, 77, 78, 78, 79, 79, 95
For the next three exercises, use the data to construct a line graph.
Solution Stem Stem Leaf
6 1124677789
7 0001124445556678899
8
9 5
95 appears to be an outlier.
Exercise In a survey, 40 people were asked how many times they visited a store before making
5. a major purchase. The results are shown in Table 1.37.
Number of times in store Frequency Frequency
1 4
2 10
3 16
4 6
5 4
Table 1.37
,Solution
Exercise In a survey, several people were asked how many years it has been since they
6. purchased a mattress. The results are shown in Table 1.38
Years since last purchase Frequency
0 2
1 8
2 13
3 22
4 16
5 9
Table 1.38
Solution
, Exercise Several children were asked how many TV shows they watch each day. The results of
7. the survey are shown in Table 1.39.
Number of TV Shows Frequency
0 12
1 18
2 36
3 7
4 2
Table 1.39
Solution
Exercise The students in Ms. Ramirez’s math class have birthdays in each of the four seasons.
8. Table 1.40 shows the four seasons, the number of students who have birthdays in
each season, and the percentage (%) of students in each group. Construct a bar graph
showing the number of students.
Seasons Number of students Proportion of population
Spring 8 24%
Summer 9 26%
Autumn 11 32%
Winter 6 18%
Table 1.40
