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Aptitude Day 150

Problems on Average:

1. Find the average of first 20 natural numbers.

Solution:
                Sum of 1st 20 natural numbers = n(n+1)/2 = 20(21)/2 = 210.
             
                Average = Sum of observations/ Number of observations
                              = 210/20
                              = 10.5.

2. Find the average of first 10 multiples of 5.

Solution:
                Sum of 1st 10 multiples of 5= 5 [n(n+1)/2] = 5[10(11)/2] = 275.
             
                Average = Sum of observations/ Number of observations
                              = 275/10

                              = 27.5.

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