UGC NET Paper 1 GA 2013 June Solved Paper

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Question : 20 of 60

Marks: +1, -0

The mean of four numbers a, b, c, d is 100. If c = 70, then the mean of the remaining numbers is

30
$85/2$
$170/3$
110

Solution:

Mean of four numbers

{a+b+c+d}/ 4=100

or,

a + b + c + d = 400

or,

a + b + 70 + d = 400

a + b + d = 400 -70

= 330

Mean

={a+b+d}/3

=330/3=110

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