Question

find the mean for the following frequency distribution: 

C.I	0-50	50-100	100-150	150-200	200-250	250-300
Freq	4	8	16	13	6	3

 

Answer 1

Class interval	Frequency (f)	Cclass mark(x)	fx
0-50	4	25	100
50-100	8	75	600
100-150	16	125	2000
150-200	13	175	2275
200-250	6	225	1350
250-300	3	275	825
Total	50		7150

Mean= `(∑fx)/(∑ f) =7150/50=143`