Question

The mean of 15, 4 , x and 10 is 9 . The value of x​

Answer 1

Answer:

the value of X is 7

Step-by-step explanation:

( 15 + 4+ X +10) /4 = 9

15 +4 +X +10 = 9×4

29 +X =36

X = 36 - 29

X=7

Answer 2

Answer:

Given

$9 = \frac{15 +4 + x +10}{4} \\ 9 \times 4 = 15 +4 +x + 10 \\ 36 - 15 - 4 - 10 = x \\ 26 - 15 - 4 = x \\ \boxed{ 7 = x}$