7th Grade Math

Test PracticeT

Lesson 4B More Statistical Displays 539

13. The number of laps Gaspar has been
    swimming each day is shown.

12345678

Laps

40

45

35

30

25

20

15

10

5

0

Day

Laps Gaspar Swims

If the trend shown in the graph

continues, what is the best prediction

for the number of laps he will swim on

day 10?

A. 50

B. 65

C. 75

D. 100

14. The number of people at the pool
    at different times during the day
    is shown.

(^) Pool Traffic
Num
ber o
f^ P
eop
le
10
A.M.
11
A.M.
12
P.M. 1 P.M. 2 P.M. 3 P.M. 4 P.M. 5 P.M. 6 P.M. 7 P.M.
Time of Day
120
100
80
60
40
20
0
If an extra lifeguard is needed when the
number of people at the pool exceeds
100, between which hours is an extra
lifeguard needed the entire time?
F. 10:00 a.m.–12:00 p.m.
G. 12:00 p.m.–3:00 p.m.
H. 2:00 p.m.–5:00 p.m.
I. 4:00 p.m.–6:00 p.m.

15. UTILITIES The table lists monthly heating costs for a household. (Lesson 4A)

Month Jan Mar May Jul Sept Nov

Heating Cost ($) 135 74 41 25 52 94

a. Make a graph of the data.

b. Predict the monthly heating cost for October.

16. MAMMALS The stem-and-leaf plot shows the maximum mass in Maximum Mass
    of Rabbits (kg)
    Stem Leaf
    0 1 2 3 4 5
    8 9
    0 2 4 6 8
    7

4

(^0) | 8 = 0.8 kg
kilograms of several rabbits.(Lesson 3E)
a. Find the range of masses.
b. Find the median and mode of the data.
c. Which measure of central tendency is most affected by the inclusion
of the outlier? Explain.
Find the median, upper and lower quartiles, and interquartile range for
each data set. (Lesson 2A)

17. stopping distances, in feet: 89, 90, 74, 81, 68


18. swimming pool water temperature, °F: 76, 90, 88, 84, 82, 78

534_545_C09_L4_895130.indd 539 1/11/10 9:46 AM