Over Lesson 13–1Over Lesson 13-4

You have already displayed data in a box-and-whisker plot. (Lesson 13–4)

• Display data using stem-and-leaf plots.

• Interpret data in a stem-and-leaf plot.

Draw a Stem-and-Leaf Plot

Step 1 The stems are the greatest place values of the data. List the stems 1, 2, 3 in order in the Stem column. Write the ones digits to the right of the corresponding stems in the Leaf column.

Step 2 Add a key that explains how to read the stems and leaves. Include a title.

Answer:

FOOD Display the data in a stem-and-leaf plot.

A. median, 24; mode, 12

B. median, 24; mode, 4

C. median, 24; mode, 24

D. median, 20; mode, 24

A. PETS The stem-and-leaf plot lists the percent of students in each class in a middle school who owns pets. Find the median and mode.

A. males B. females

C. Both groups had an equally high score.

D. cannot be determined

A. EXAM SCORES The exam scores earned on the first test in a particular class are shown for male and female students. Which group of students had the higher test scores?

Male Female

8 2 6

9 6 4 7 4 8 8 9

7 4 2 2 0 8 1 3 4 8 9

6 5 3 9 2 5 92|8 = 82 7|4 = 74

A. males B. females

C. Both groups had equally varied scores.

D. cannot be determined

B. EXAM SCORES The exam scores earned on the first test in a particular class are shown for male and female students. Which group of students had more varied test scores?

Male Female

8 2 6

9 6 4 7 4 8 8 9

7 4 2 2 0 8 1 3 4 8 9

6 5 3 9 2 5 92|8 = 82 7|4 = 74