Question

Ans. 69.18.
3. Find the mean for the following distribution:
Marks
No. of students
Marks
No. of students
0-10
3
50-60
15
10-20
5
60-70
12
20-30
7
70-80
6
30–40
10
80-90
2
40-50
12
90-100
8​

Answer 1

Answer:

mean = sum of all observation/total no. of all observation

3+15+5+12+7+6+10+2+12+8/10=8