Question

use a stem - and - leaf plot to display the data, which represent the scores of a biology class on a midterm exam. describe any patterns.
75 85 90 80 87 68 82 88 95 91 71 80
83 92 94 68 75 91 90 87 76 91 85 69

determine the leaves in the stem - and - leaf plot below.
key: 3|3 = 33
exam scores
6
7
8
9

Explanation:

Step1: Identify scores for each stem

For stem 6, the scores are 68, 68, 69. So the leaves are 8, 8, 9.

Step2: Identify scores for stem 7

The scores for stem 7 are 71, 75, 75, 76. So the leaves are 1, 5, 5, 6.

Step3: Identify scores for stem 8

The scores for stem 8 are 80, 80, 82, 83, 85, 85, 87, 87, 88. So the leaves are 0, 0, 2, 3, 5, 5, 7, 7, 8.

Step4: Identify scores for stem 9

The scores for stem 9 are 90, 90, 91, 91, 91, 92, 94, 95. So the leaves are 0, 0, 1, 1, 1, 2, 4, 5.

Answer:

6 | 8 8 9
7 | 1 5 5 6
8 | 0 0 2 3 5 5 7 7 8
9 | 0 0 1 1 1 2 4 5