Question

If the arithmetic mean of x, x+2, x+5, x+9 and x + 10 is 10, then x is ———–

Answer 1

Answer:

3

Step-by-step explanation:

The arithmetic mean = 10

$\frac{ x + x+2 + x+5+ x+9 + x + 10}{10}$ = $\frac{30x}{10}$

$x =$ $\frac{30}{10}$

$x = 3$

Answer 2

x = 3

x+x+2+x+5+x+9+x+10= 10  (given in question)

mean formula = sum of all values / total no of value

below is the equation for this question

x+x+2+x+5+x+9+x+10 / 5  = 10

5x + 26 /5 = 10

by cross multiplication

5x + 26 = 50

5x = 50 -26 = 24

x = 5/24