Question

The mean of 5 observations 3,5,7,x and 11 is 7, find the value of x

Answer 1

mean= 3+5+7+11+x/5
7=26+x/5
35=26+x
35-26=x
x=9

Answer 2

The value of x is equal to 9.

Step-by-step explanation:

Given,

The mean of 5 observations = 7

To find, the value of x = ?

Here, number of observations = 5

We know that,

Mean = $\dfrac{Sum of observations}{Total number of observations}$

⇒ $\dfrac{3+5+7+x+11}{5} =7$

⇒ $26+x =7\times 5=35$

⇒ $x=35-26$

⇒ x = 9

Hence, the value of x is equal to 9.