Question

Find the average of first 25 multiples of 5

Answer 1

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Answer 2

Answer:

Average = 65

Step-by-step explanation:

The first 25 multiples of 5 are

5,10,15,.........125

This is an A.P with a = 5 , d= 5 and l =125, n= 25

Hence, sum of 25 terms are

$S=\frac{n}{2}(a+l)\\\\ S=\frac{25}{2}(5+125)\\\\ S=\frac{25}{2}\cdot130\\\\S=1625$

Now, formula for average is

Average = Sum of observation/Total

Average = 1625/25

Average = 65