Question

What is the average of first 20 multiples of 8​

Answer 1

Answer:

ap=8,16,24,.160.

Step-by-step explanation:

here it is

Answer 2

SOLUTION

TO DETERMINE

The average of first 20 multiples of 8

EVALUATION

Here we have to find the average of first 20 multiples of 8

The numbers are 8 , 16 , 24 ,... , 160

This is an arithmetic progression

First term = a = 8

Common Difference = d = 16 - 8 = 8

Number of terms = 20

Sum of the 20 numbers

$\displaystyle \sf{ = \frac{n}{2} \times \bigg( First \: term \: + Last \: term \bigg)}$

$\displaystyle \sf{ = \frac{20}{2} \times \bigg( 8 + 160\bigg)}$

$\displaystyle \sf{ =10 \times 168}$

$\displaystyle \sf{ = 1680}$

Hence the required average

$\displaystyle \sf{ = \frac{1680}{20} }$

$\displaystyle \sf{ = 84}$

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