Question

. Find the mean of the following frequency distribution.


9. Simplify:
124×9
3×4
6
3×8
2×27
Marks 16 17 18 19 20 22 23 24 25
No.of
students
1 1 3 1 5 3 5 4 2

Answer 1

Answer:

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

hope its helpful