Question

The average of the 7 numbers 7,9,12,x,5,4,11 is 9. Then the missing number x is?

Answer 1

Hi Friend !!!


Here is ur answer ...,,,


Average of 7,9,12,x,5,4,11 is 9

7+9+12+x+5+4+11/7 = 9


48+x = 9×7

x = 63-48

x = 15


Hope it helps u : )

Answer 2

Given:

The average of 7 numbers=9

To find:

The value of x

Solution:

The value of x is 15.

We can find the value by following the given steps-

We know that the average of the given terms can be obtained by dividing the sum of all the terms by the number of terms.

So, the average of the 7 numbers=Sum of 7 numbers/ 7

The given numbers are-

7, 9, 12, x, 5, 4, 11

Sum of the given 7 numbers=7+9+12+x+5+4+11

=48+x

We are given that the average of these numbers is equal to 9.

On putting the values, we get

The average of the 7 numbers=(48+x)/7

9=(48+x)/7

9×7=(48+x)

63=48+x

63-48=x

15=x

Therefore, the value of x is 15.