SSC CHSL 10 Jan 2017 Shift 3 Paper

Question : 87 of 100

Marks: +1, -0

The mean of marks secured by 55 students in division-A of class X is 55, 45 students of division-B is 51 and that of 40 students of division-C is 49. What is the mean of marks of the students of three divisions of class X?

51.3
50.6
52
53.4

Validate

Solution:

Total marks secured by 55 students in division A = 55 ×55 = 3025
Total marks secured by 45 students in division B = 45× 51 = 2295
Total marks secured by 40 students in division C = 40 ×49 = 1960
⇒ Mean of marks of the students of three divisions of Class X =

(3025+2295+1960)/(55+45+40)

7280 /140 = 52

Go to Question:

Prev Question

Next Question