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Railway Exam > Learn Railway Exam > What is the average value of first 15 natural numbers?
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What is the average value of first 15 natural numbers?

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1+2+......+15 = 15(15+1)/2 = 15*16/2 = 15*8 =120
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firstly the first 15 natural numbers are 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 now, mean = sum of the numbers / total number of numbers = (1+2+3+4+5+6+7+8+9+10+11+12+13+14+15) / 15 =120/15 =8
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Average of first n natural numbers = (n+1)/2 Here, Avg = (15+1)/2 = 16/2 = 8.
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Avg of N number with a distinct relationship between them is always:- (Sum of 1st and last number )/2. In this case (1+15)/2 =16/2 =8.
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