7th Grade Math

550 Statistical Displays

Practice

Chapter Test

1. INSECTS The lengths in inches of several
   insects are given below. Find the difference
   of the mean, median, and mode with and
   without the extreme value in the data set.
   Round to the nearest tenth if necessary.
   0.75, 1.24, 0.95, 8.6, 1.18, 1.3


2. BASKETBALL Refer to the histogram.

Basketball Game Results

25–2930–3435–3940–4445–4950–5455–5960–64

Total Points Scored

Number of Games

8 7 6 5 4 3 2 1 0

a. How large is each interval?

b. What was the most likely point

total?

c. In what percent of games were 50

points or more scored?

3. TIME Refer to the table.

Daily Activities

Activity Type Average Time (min)

Cardio 21

Clean room 15

Dishes 12

Download music 20

E-mail 18

Homework 56

Trash 11

a. What is the range of the data?

b. Find the median, upper and lower

quartiles, and the interquartile range

for the data.

c. Identify any outliers.

d. Use the measures of variation to

describe the data in the table.

4. MULTIPLE CHOICE Refer to the data below.
   Which of the following statements is true
   concerning the measures of central
   tendency?

41, 45, 42, 38, 77, 44, 36, 43

A. The mode is most affected by the

inclusion of the extreme number.

B. The median is not affected by the

inclusion of the extreme number.

C. The mean is most affected by the

inclusion of the extreme number.

D. None of the measures of central

tendency are affected by the inclusion

of the extreme number.

5. EXERCISE

’06 ’07 ’08 ’09 ’10 ’11

10

20

30

40

Percent (%)

50

Year

0

Women Who Work Out

The graph After Work

shows the

percent of

women who

work out after

work. Predict

the number of

women who

will work out

after work in 2015.

6. EXTENDED RESPONSE Ronan asked his
   friends how many CDs they own.
   Below is the data Ronan collected from
   his friends.
   0, 0, 3, 5, 6, 8, 9, 15, 15, 15, 18, 20, 20, 28, 31
   Part A Construct a box-and-whisker plot
   with the data set given above.
   Part B What is the greatest amount of
   CDs owned by Ronan’s friends?
   Part C Explain why the median is not in
   the middle of the box.

546_550_C09_SGR_895130.indd 550 1/11/10 9:47 AM