Question

The mean of marks secured  by 55 students in division A of class X is 58, 45 students of division B is 54 and that of 75 students of division C is 52. Find the mean of marks of the students of three divisions  of Class  X.

Options:

1) 53.7

2) 54.4

3) 53

4) 55.8

Answer 1

55.8 is the answer i think

Answer 2

Hi frd,
In class A,The addition of marks=55×58=3190.
In class B,The addition of marks=45×54=2430.
on class C The addition of marks=75×52=3900.
Mean=3190+2430+3900/55+45+75
9520/175=54.4
l hope it is helpful to you....
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