Question

find the mean average of class interval 0-10 10-20 20-30 30-40 40-50 frequency 7 12 13 10 8
1)3
2)2
3)2.5​

Answer 1

Answer:-

Class interval Frequency (f

i

) x

i

=

2

lower limit + upper limit

f

i

x

i

0−10 7 5 35

10−20 8 15 120

20−30 12 25 300

30−40 13 35 455

40−50 10 45 450

Σf

i

=50 Σf

i

x

i

=1360

Mean =

Σf

i

Σf

i

x

i

=

50

1360

=27.2