Chapter 9 Test - Statistics

1) The following table shows the number of pages in novels that

If Madison read only 125 pages during the month of May, which

measure of data changed the most?

 Sept Oct Nov Dec Jan Feb Mar Apr 370 393 380 376 396 372 385 391

B. Median

A. Mean

D. All measures were affected equally.

C. Mode

2) The graph shows the average number of hours per week that students in

A. The title of the graph is misleading.

B. The grade intervals do not show

how much time college students use

computers.

C. The vertical scale should show

D. The inervals on the vertical scale

are not consistent.

Which statement best explains why a

person reading the graph might get

an incorrect idea about the differences

in the number of hours computers are

used by students in the grades shown?

3) The box-and-whisker plot shows the average class sizes in 15 schools.

B. The largest class size is 31.

C. About one-half of the classes range in size from 23 to 31.

D. The median class size is 23.

A. The range of the class sizes is 8.

Which statement about the class sizes must be true?

lowest grade, a 72, which equation can be used to find n, Jade’s new

quiz average?

A.    A = (95x15)-72

14

B.     A = 95 - 72

14

C.   A = (95x15)-72

15

D.   A = 95(72-15)

14

From these results, Kaitlyn concluded that band was the favorite class

among all the students at her school. Which is the best explanation for

why her conclusion might not be valid?

5) Kaitlyn surveyed all the members of the middle school band about their

favorite class this semester. The results are shown in the table.

A. The survey should have been done each day for a week.

B. The sample was not representative of all the students at the school.

C. The survey should have been done with eighth-grade students only.

D. The band meets only 3 days a week.

6) Amber can read an average of 18 pages during a 30-minute reading

period at school. At this rate, approximately how long will it take her

C. 23 hours

D. 42 hours

A. 11 hours

B. 21 hours

Compact Discs Owned by Classmates

7) Use the Histogram shown below to answer the question.

Number of CDs Owned

How many classmates own

more than 300 CDs?

A. 16
B. 2
D. 22
C. 6

Compact Discs Owned by Classmates

8) Use the Histogram shown below to answer the question.

Number of CDs Owned

How many classmates

were surveyed?

A. 22

B. 19
C. 21
D. 20

9) A retail store had total sales of \$436, \$650, \$530, \$650, \$500,

\$489, and \$423 last week. Which measure of data would make

the store’s sales last week appear the most profitable?

D. Range

B. Median

C. Mode

A. Mean

10) The stem-and-leaf plot shows the highest recorded February

temperature measured in degrees Fahrenheit for 12 U.S. Cities.

Highest Recorded Feb. Temperature (°F)

In how many cities is the highest recorded February temperature below 43°?

A. 5
 STEM LEAF 3 7, 8, 9 4 2, 2, 6, 7 5 3, 4, 5 6 0, 2
B. 6
C. 7
D. 8

11) Choose an appropriate display for the set of data in the table below.

C. Line Graph

A. Histogram

 Students in School Clubs Club Members Pep Club 237 Math Club 45 Science Club 52 Chess Club 23 Spanish Club 62

B. Circle Graph

D. Scatter Plot

12) Which of the following choices would be appropriate to display sales

of the best selling type of car?

B.  bar graph

C.  histogram

D.  line graph

A.  scatter plot

13) The circle graph shows the income from a school fair.

D.  Twice as much was spent to prepare

the food as to set up the games.

C.  The rides brought in \$40,000 in revenue.

A.  The raffle produced three times

as much income as the food.

B.  The income from food was twice as

much as the income from the games.

Which of the following conclusions

is supported by this graph?

Which measure would make it seem as if Julia got very few phone calls each day?

14) The number of phone calls Julia received on her cell phone each day

for the past week is listed in the table below.

Julia’s Phone Calls

A.  Mean

B.  Median

 Day Calls Sunday 2 Monday 14 Tuesday 16 Wednesday 13 Thursday 20 Friday 32 Saturday 2

C.  Range

D.  Mode

15) Ms. Henslee made the following box-and-whisker graph of the quiz

A.  70

What is the median quiz grade for the class?

B.  77

C.  96

D.  86

16) Luke’s math scores for this grading period are listed:

84, 86, 83, 78, 92, 87, 92, 90, 88, 86

Which line plot correctly shows his scores?

C
D
A
B

17) This graph displays the weights of packages shipped from a post office

on Tuesday. According to information in the graph, no 10-12 pound

packages were shipped.

Which statement explains why this representation may be misleading?

C.  The intervals are too small.

B.  The vertical bars are too wide.

D.  The scale for the number of packages goes higher than 90.

A.  The scale for the number of packages

does not start at 0.

18) Mrs. Plachy surveyed the students in her science classes about the type and number

of pets they owned. The table shows the results of the survey.

Which circle graph best represents the type and number of pets reported by students

in the survey?

A
B
C
D

19) Which graph shows an overall decrease in the amount of sales revenue

over time?

A
B
D
C

20) A store manager collects data showing the number of times each brand

of soap is purchased in his store. Which measure of data shows which

brand he sells most?

A.  Range
B.  Mode
C.  Median
D.  Mean
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