BA LLB Banaras Hindu University 2016 Solved Paper

Question : 120 of 170

Marks: +1, -0

The mean of 100 items was found to be 30 . If at the time of calculation, two items were wrongly taken as 32 and 12 instead of 23 and 11, the correct mean is

$29.4$
$29.5$
$29.8$
$29.9$

Validate

Solution:

Total value of 120 items

=100 × 30=

₹3000
Let difference due to wrong calculation

=32-23=9

and

12-11=1

Greater taken value

=10

So, remaining correct value

=3000-10=2990

∴ \;\;

Required mean

=\;{2990}/{100}=29.90

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