Question

find the arithmetic mean of the

following data

Class interval frequency

0-10 5

10-20 7

20-30 15

30-40 28

40-50 8​

Answer 1

Answer:

class interval frequency (f) mean value (x) fx

0 - 10 7 5 35

10 - 20 14 15 210

20 - 30 28 25 700

30 - 40 26 35 910

40 - 50 19 45 720

50 - 60 9 55 495

Sum 100 3070

A.M.=

∑f

i

∑f

i

x

i

=

100

3070

=30.7