What is the average of first 21 multiples of 4 ?

What is the average of first 21 multiples of 4 ?

Answer/Solution

A)44

Steps/Work

Required average = 7(1+2+....+21) / 21
(4/21)X ( (21x22) / 2 ) (because sum of first 21 natural numbers)
= 44
A

General Calculator / Auto Solver

What is the average of first multiples of ?

Calculated Answer

44

Step by Step Solution

In order to solve problem, you must evaluate n₁ * ((n₀ * (n₀ + 1)) / 2) / n₀.

n₀ =	21
n₁ =	4

n₁ * ((n₀ * (n₀ + 1)) / 2) / n₀
Evaluate n₀ + 1 = 22
n₁ * ((n₀ * 22) / 2) / n₀
Evaluate n₀ * 22 = 462
n₁ * (462 / 2) / n₀
Evaluate 462 / 2 = 231
n₁ * 231 / n₀
Evaluate 231 / n₀ = 11
n₁ * 11
Evaluate n₁ * 11 = 44
44
The answer to the problem and the result of n₁ * ((n₀ * (n₀ + 1)) / 2) / n₀ is 44