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Question

The average of first 50 natural numbers is

A
12.25
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B
21.15
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C
25
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D
25.5
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Solution

The correct option is B 25.5

The first 50 natural numbers are 1,2,3,...,50

We know that, the sum of first n natural numbers is n(n+1)2

Therefore, sum of first 50 natural numbers is =50×512=25×51=1275

We know that, Average of n number of observations =sum of all the observationsNumber of observations

Here the number of observations are 50.

Average of first 50 natural numbers

=127550

=25.5

Hence, the average of first 50 natural numbers is 25.5

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