Question

What is the arithmetic mean of the numbers $a$ and $b$?

• A. $\frac{a+b}{a-b}$
• B. $\frac{a+b}{2}$
• C. $a+b$
• D. $\frac{a-b}{2}$

Answer 1

The correct option is B

$\frac{a+b}{2}$

The arithmetic mean of two numbers is the simple average of the two numbers.

Thus,

$AM=\frac{\text{Sum of the numbers}}{\text{Number of numbers}}$

$=\frac{a+b}{2}$