Question

quiz scores
stem|leaf
5|7 9
6|4 5 7
7|0 3 6
8|2 2 4 8
9|2 5 9
10|0 0
key: 8|4=84
how many students scored less than 70%?

Explanation:

Step1: Identify scores less than 70

Look at stem - leaf plot for scores in 50s and 60s.

Step2: Count the scores

In 50s, there are 2 scores (57, 59). In 60s, there are 3 scores (64, 65, 67).

Answer:

5