Average - Quantitative Aptitude (MCQ) questions for Q. 20623

Q.  Find the average of first 30 natural numbers.
- Published on 07 Jul 17

a. 12
b. 15.5
c. 14.5
d. 16

ANSWER: 15.5
 
Sum of first n natural numbers = n(n+1)/2
Hence, sum of first 30 natural numbers = (30 x 31)/2 = 465
Therefore, required average of = 465/30 = 15.5

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