Question

If the mean of 3, 1, 5, x and 9 is 4, then find the value of x. ​

Answer 1

Answer:

The value of x is 2

Step-by-step explanation:

The mean of 3, 1, 5, x, 9 is 4

Therefore, (3+1+5+x+9)/5=4

⇒(18+x)/5=4

⇒ 18+x = 5×4

⇒ x = 20-18  = 2

Answer 2

Answer:

The required value of  $x$ is $2$.

Step-by-step explanation:

Given : Mean of numbers $3,1,5,x$ and $9$ = $4$

To find : The value of $x$.

Solution :

• It is given that the mean of numbers $3,1,5,x$ and $9$ = $4$
• We have to find the value of $x$.
• Mean is nothing but the arithmetic average of given numbers.
• So, The formula for mean is the ratio of sum of all numbers to the total numbers.

       Mean = $\frac{3+1+5+x+9}{5} =4$    

                       ∴  $\frac{18+x}{5} =4$

• Transpose $5$ to other side, we get

                      ∴ $18+x=4*5$

                     ∴ $18+x=20$

• Transpose $18$ to other side, we get

                           ∴ $x=20-18$

                           ∴ $x=2$

• ∴ The required value of  $x$ is $2$.