Question

Below is given the distribution of money (in) collected by students for flood relief fund:

Money(in)	0-10	10-20	20-30	30-40	40-50
Number of students	5	7	5	2	6

Find the mean of money (in) collected by a student using 'Direct Method'

Answer 1

Money (in ₹)	Class Mark x	No. of students f	fx
0-10	5	5	25
10-20	15	7	105
20-30	25	5	125
30-40	35	2	70
40-50	45	6	270
TOTAL	-	25	595

Σf_x = 595 ;

Σf = 25

Mean by Direct Method

Mean (`bar"x"`) = `"Σf"_"x"/"Σf"`

= `595/25`

Mean(`bar"x"`) = ₹23.8/-