Question

the mean of 7,8,9,11andx is 10 then find x​

Answer 1

Answer:

The value of x will be 15

Step-by-step explanation:

Here it is given that the mean of 7, 8, 9, 11 and x is equal to 10

We have to find the value of x

sum of numbers = 7 + 8 + 9 + 11 + x

                            = 35 + x

total numbers = 5

So, mean = sum of numbers/total number

           10 = (35 + x)/5

           50 = 35 + x

             x = 50 - 35

             x = 15

Answer 2

Answer:

Value of $x$ is $15$ .

Step-by-step explanation:

To find : value of $x$ .

Given : mean of  $7,8,9,11$ and $x$  is $10$ .

Solution  :

• Average is the arithmetic mean.
• It is the ratio of sum of all the numbers given in data to the total number of observations.
• Formula: $Average \ or \ mean =\frac{\text { sum of all the observations }}{\text { total of observations }}$
• As per given data we know that mean of  $7,8,9,11$ and $x$  is $10$ .
• Here, sum of observations $= 7 + 8 + 9 +11 +x$

                                                     $= 35 + x$

• Total number of observations = $5$
• Mean = $10$  
• By substituting values in above formula we get value of $x$ ,

        $10= \frac{35 +x}{5} \\ \\50 = 35 + x \\\\50 -35 = x \\ \\x = 15$