7th Grade Math

Mid-Chapter

Check

Find the mean, median, and mode for each

set of data. Round to the nearest tenth if

necessary. (Lesson 1B)

1. number of suits dry cleaned each week: 22,
   14, 37, 25, 21, 22, 20


2. number of cars washed each week: 65, 50,
   57, 75, 76, 66, 64


3. prices of magazines: $3.50, $3.75, $3.50,
   $4.00, $3.00, $3.50, $3.25


4. MULTIPLE CHOICE The table shows the
   average April rainfall for 12 cities. If the
   value 4.2 is added to this list, which of the
   following would be true? (Lesson 1B)

Average Rainfall (in.)

0.5 0.6 1.0 1.0 2.5 3.7

2.6 3.3 2.0 1.4 0.7 0.4

A. The mode would increase.

B. The mean would increase.

C. The mean would decrease.

D. The median would decrease.

5. QUIZ Cedro had quiz scores of 9, 10, 7, 7, 2,
   6, 9, 10, 10, and 8. Which measure of
   central tendency would Cedro want his
   teacher to use to compute his final grade?
   Explain. (Lesson 1B)


6. TEST PRACTICE The table shows the pace for
   a half marathon. What measure of central
   tendency is most affected by the extreme
   value? (Lesson 1B)

Pace for Half Marathon (mph)

6.7 7.1 7.5 7.6 3.3

7.4 7.2 7.4 7.1 7.4

6.8 6.9 7.3

F. mean H. mode

G. median I. no effect

7. FOOD The table shows the sodium content
   of items on a restaurant menu. (Lesson 2A)

Sodium (mg)

180 380 240 330 220

210 290 500 260 440

400 320 490 300 480

a. Find the range of the data.

b. Find the median and upper and lower

quartiles.

c. Find the interquartile range.

d. Identify any outliers of the data.

8. NUTRITION The box-and-whisker plot
   shows the number of Calories in various
   low-fat granola bars. (Lesson 2B)

70 80 90 100 110 120 130 140 150 160 170 180

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Number of Calories

a. What is the least number of Calories?

b. What is the upper and lower quartile?

c. What percent of the granola bars had

Calories between 120 and 160?

d. A quarter of the granola bars had more

than what number of Calories?

9. MIDDLE SCHOOL The number of students in
   each seventh grade homeroom is shown
   below. (Lesson 2B)
   29, 15, 22, 30, 32, 46, 26, 22, 36, 31
   a. Draw a box-and-whisker plot for the
   data.
   b. Describe the data.

512 Statistical Displays

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