Question

If - 9
then the value of x is
5 10​

Answer 1

What this question means

Answer 2

Answer:

Given,

The arithmetic mean = 9

To find, the value of x = ?

We know that,

Arithmetic mean =\dfrac{Sum of observations}{Number of observations}

Numberofobservations

Sumofobservations

⇒ \dfrac{5+7+9+x}{4}=9

4

5+7+9+x

=9

⇒ \dfrac{21+x}{4}=9

4

21+x

=9

⇒ 21+x=9\times 4=3621+x=9×4=36

⇒ x=36-21=15x=36−21=15

∴ x=36-21=15x=36−21=15