SSC CHSL 9 Jan 2017 Shift 3 Paper

Question : 60 of 100

Marks: +1, -0

The mean of marks secured by 30 students in division-A of class X is 67, 55 students of division-B is 63 and that of 40 students of division-C is 61. What is the mean of marks of the students of three divisions of Class X?

63.32
62.62
61.92
64.72

Validate

Solution:

Total marks secured by 35 students in division A = 30 × 67 = 2010
Total marks secured by 45 students in division B = 55 × 63 = 3465
Total marks secured by 70 students in division C = 40 × 61 = 2440
⇒ Mean of marks of the students of three divisions of Class X =

{(2010+3465+2440)}/(30+55+40)

7915/125 =63.32

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