Question

There are 68 student of 9th std from model highschool nandguru they have scored following marks out of 80 in exam of maths 70,50,60,66,45,46,38,30,40,47,56,68,80,79,39,43,57,61,51,32,42,43,75,43,36,37,61,71,32,40,45,32,36,42,43,55,56,62,66,72,73,78,36,46,54,57,60,36,37,45,42,70,57,45,66,56,47

By taking classes 30 to 40, 40 to 50............. prepare the less than type cumilivity frequency table

Answer 1

30-40 there are 14 students
40-50 there are 20 students
50-60 there are 11 students
60-70 there are 12 students
70-80 there are 9 students
80-90 there are 2 students
14
14+20=34
34+11=45
45+12=57
57+9=66
66+2=68