Question

What will be the average of first four positive multiples of 8?

• A. 16
• B. 20
• C. 32
• D. 24

Answer 1

Answer:

B. 20

Solution:

Concept:

In this type of question we use the formula of sum of n natural numbers. And then divide the sum by total number of the terms.

Formula Used:

S_n = $\frac{n}{2}$(First term + last term)

⇒ n = no. of terms

⇒ First term = 8 

⇒ Last term = 32

Average = sum of all the terms / total numbers

Calculation:

S_n = $\frac{4}{2}(8 + 32)$

⇒ S_n = 2(40)

⇒ S_n = 80

∴ Average = $\frac{80}{4} = 20$