Find out the mean from series given below

Question

Marks               No.of Students
 0 – 10                             8
10 – 20                           10
20 – 30                          15
30 – 40                           7
40 – 50                           5
50 – 60                           5

Answer 1

Marks	No. of Students (f)	Mid value (m)	fm
0-10	8	5	40
10-20	10	15	150
20-30	15	25	375
30-40	7	35	245
40-50	5	45	225
50-60	5	55	275
	Σf = 50		Σfm = 1310

Mean:

= \(\frac{1310}{50}\)

= 26.2