Question

b) Marks obtained by 110 students in English test are given below:
[3]
Marks
0 - 10
10 - 20
20 - 30
30 - 40
40 - 50
50 - 60
60 - 70
70 - 80
6
10
13
23
20
77
Number
of
students
Calculate the mean marks correct to nearest whole number using step deviation method.​

Answer 1

Answer:

179/53 so You can do from here now solve it