Score: 1-10 and number of students 1.
score 11-20 and number of students 2.
score 21-30 and number of students 0.
score 31-40 and number of students 1.
score 41-50 and number of students 0.
score 51-60 and number of students 6.
score 61-70 and number of students 10.
score 71-80 and number of students 5.
score 81-90 and number of students 3.
score 91-100 and number of students 2.

Find measure of central tendency (mean, median and mode)