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Question

What is the mean of the first ten natural numbers?


A

4.5

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B

5.5

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C

6.5

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D

5

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Solution

The correct option is B

5.5


The first 10 natural numbers are 1 to 10.

Sum of first n natural numbers = n(n+1)2
here, n = 10
So, sum of first 10 natural numbers
= 10(10+1)2 = 10×11 2 = 55

Mean = Sum of first 10 natural numbersn
Mean = 5510 = 5.5

Thus, 5.5 is the mean of the first ten natural numbers.


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