A teacher shows her class the scores on the midterm exam in the stem-and-leaf plot:

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

(a) Identify the number of students and the minimum and maximum scores.

(b) Sketch a corresponding histogram with four intervals.