Principal Randolph reported the state test scores from some students at his school.

Test scores
Stem Leaf
1 3 9
2 0 5 6 6
3 9
4 4 5 6 7 9
5 5 8 9 9
6 0 2 2 3 5 7
7 3 3 6


How many students scored at least 10 points but fewer than 40 points?