Average Practice Test 2

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Question : 38 of 40

Marks: +1, -0

Find the average of the first 20 natural numbers.

11.5
10.5
20.5
9.5
13.5

Solution:

The sum of the first natural numbers

={n(n+1)}/2

So, the sum of the first 20 natural numbers

={ 20 ×21}/2= 210

∴ Required average

=210/20= 10.5

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