Question

. Find the mean of the following data:
Marks
10-14 15-19 20-24 25-29 30-34
4
6
12
5
3
No. of
students
Class
1-10
11-20 21-30 31-40 41-50
Frequency
3
4
2
5
6
plzzz
as fast as u can
plzz​

Answer 1

Answer:-

class interval Mid-point

x

i

Frequency

f

i

f

i

x

i

25-29 27 14 378

30-34 32 22 704

35-39 37 16 592

40-44 42 6 252

45-49 47 5 235

50-54 52 3 156

55-59 57 4 228

Σf

i

=70 Σf

i

x

i

=2545

Mean=

Σf

i

Σf

i

x

i

=

70

2545

=36.36