Question

age (in yrs) 13 14 15 16 17 18. no of student 3 8 9 11 6 3. calculate the mean of age of the students

Answer 1

Age of 1st grp = 13 * 3 = 39
2nd grp = 14 * 8 = 112
3rd grp = 15 * 9 = 135
4th grp = 16 * 11 = 176
5th grp = 17 * 6 = 102
6th grp = 18 * 3 = 54
Sum = 618
Total students
= 3 + 8 + 9 + 11 + 6 + 3 = 40

Mean age = 618/40 = 15.45 years