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 6 889 7 1556 8 002355778 9 00111245 what best describes the data? a. most of the scores are in the 60s and 70s. b. most of the scores are in the 70s and 80s. c. the scores are evenly spread from the 60s to the 90s. d. most of the scores are in the 80s and 90s.

Explanation:

Step1: Count scores in each decade

Count the number of scores in the 60s, 70s, 80s, and 90s from the stem - and - leaf plot. In the 60s, there are 3 scores (68, 68, 69). In the 70s, there are 4 scores (71, 75, 75, 76). In the 80s, there are 8 scores (80, 80, 82, 83, 85, 85, 87, 88). In the 90s, there are 7 scores (90, 90, 91, 91, 91, 92, 94, 95).

Step2: Analyze the distribution

Compare the number of scores in each decade. We see that the combined number of scores in the 80s and 90s (8 + 7=15) is the largest compared to other decades.

Answer:

D. Most of the scores are in the 80s and 90s.