Question

The mean of observation 10, 15 , x, 5 , 15, is 15 .what is the value of x

Answer 1

Here is the solution :

Mean is nothing but Average !.

Mean =
(Sum of Observations)/(No.of Observations)

Now,
Given data :

10, 15, x,5,15,

Sum of them = 45+x,

No. of Observations = 5,

From the Question, We can write this,

(45+x)/5 = 15,

=> 45+x = 75,

=> x = 30,

Therefore : The value of x is 30,

Hope you understand, Have a Great day !..
Thanking you, Bunti 360 !..

Answer 2

sum of all integer upon no. of integer = m ean
45+ x upon 5 = 15

45 + x = 75
x = 75- 45. = 30