Question

If the arithmetic mean of 7,5,13, x and 9 is 10, then the value of x is

• A. 10
• B. 12
• C. 14
• D. 16

Answer 1

The correct option is D

16

Arithmetic mean of 7,5,13,x, 9 is 10.

Mean $=\frac{7+5+13+x+9}{5}=\frac{34+x}{5}$

$\therefore \frac{34+x}{5}=10\Rightarrow$ 34+x = 50

$\Rightarrow$ x = 50-34 = 16

$\therefore$ x = 16