Name _______________________________
1. A baseball team manager records the number of runs scored by the team in each game for several
weeks.
1, 3, 1, 7, 2, 0, 11, 2, 2, 3, 1, 3, 4, 2, 2, 4, 5, 2, 6
a. Use the data to make a dot plot.
b. What is the spread of the data?
c. Where is the data centered?
d. Is there a peak in the data? If yes, where?
e. Describe the distribution of the data.
f.
At how many games did the team score 2 or fewer runs? How do you know?
2. While in the hospital, a nurse measured a patient’s heart rate at different times over several days.
The results are shown in the box below.
Heart Rate (beats per minute)
86, 87, 89, 87, 86, 88, 90
85, 82, 86, 83, 85, 84, 86
a. Use the data to make a dot plot.
b. What is the spread of the data?
c. Where is the data clustered?
d. Is there a peak in the data?
e. Describe the distribution of the data.
f.
The nurse collected the data when the patient was resting. How might the dot plot change if
the nurse also collects data when the patient is exercising?
Name _______________________________
3. Pets-R-Us randomly asked customers purchasing cat food how many times they feed their cat each
day. The line plot below shows the survey results.
Number of Feedings Per Day
Which of the following statements is not true about the results?
A
Twenty-five customers were surveyed.
B
The median number of feedings per day is 2.
C
The mean number of feedings per day is 2.2.
D
65% of the customers surveyed feed their cat less than 3 times a day.
4. Rhonda counted the number of bars of candy in 15 bags of Choco-Crunch candy bars. She found that
a bag may contain as few as 10 bars or as many as 15 bars. Rhonda displayed the data with the dot
plot shown below.
Which statement is best supported by the information in the dot plot?
A
The mode of the data is 14.
B
The mean number of bars per bag is 12.5.
C
The median of the data is 12.
D
20% of the bags Rhonda counted had 14 candy bars.
Name _______________________________
Dot Plot Mania
Ms. Harbers and Ms. Bachansingh had students in their first period measure their heights in inches. Their
data was recorded on the dot plots below.
56
58
60
62
64
66
68
70
72
74
76
Heights of Students in Ms. Harbers’ Class
56
58
60
62
64
66
68
70
72
74
76
Heights of Students in Ms. Bachansingh’s Class
5. Which class appears to have a greater number of taller students? Explain how you know.
6. Which class has the greater spread of data? Explain how you know.
7. Which class has data that is more clustered and centered? Explain how you know.
8. Which class has the greater median? What is that median?
9. Suppose a set of triplets, each measuring 74 inches, enrolled in Ms. Bachansingh’s class. How
would adding these students affect the numerical measures of center for Ms. Bachansingh’s class?
(A calculator is helpful!)
Name _______________________________
Dot Plot Mania
Tyrone counted the number of pieces of candy in 25 packages of Skittles™ and in 25 packages of
M&M’s.™ His data is represented in the dot plots below.
12
13
14
15
16
17
18
19
20
21
22
21
22
Number of Skittles™ in a Package
12
13
14
15
16
17
18
19
20
Number of M&M’s™ in a Package
10. Which candy’s data appears to have a greater spread? Explain how you know.
11. Which candy has greater measures of center? Explain how you know. (A calculator is helpful!)
12. Which candy’s data appears to be more symmetric? Justify your answer.
13. Which of the following is true based on the data provided?
A.
A package of M&M’s™ has more pieces than a package of Skittles.™
B.
A package of M&M’s™ will never have more than 21 pieces.
C.
The number of pieces in a package of Skittles™ varies more than the number of pieces in a
package of M&M’s.™
D.
The measures of center are the same for both candy brands.