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Q.

Find the arithmetic mean of first 10 natural numbers.


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a

55

b

550

c

5.5

d

None of the above 

answer is C.

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Detailed Solution

First 10 natural numbers are 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
Total number = 10
So, arithmetic mean,
AM=1+2+3+4+5+6+7+8+9+1010
=n⋅(n+1)210                                   (Since n= 10)
=10.11210
=5.5
Thus, arithmetic mean is 5.5.
Correct option is 3.
 
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