The stem-and-leaf plot shows the test scores for a chemistry class. How many students had a score less than 82 points?
5 2
6 4 6
7 0 1 4 6 8 8 8
8 0 1 2 3 4 6 8 8
9 1 2 3 4 6 7
100
Key: 74 = 74
3
o 15
O 12