Question

If the mean of 7, 4, x and 10 is 8, the value of x is-

Answer 1

Explanation:

(4+7+10+ x)/4 = 8

(21 + x)/4 = 8

Cross multiply

21 + x = 32

Subtract 21 both sides

21 - 21 + x = 32 - 21

x = 11

Answer 2

The value of x is 11.

To find x, we must know how to calculate mean.

Mean = (all values added together) / (number of values in the set)

Now we can plug in our numbers:

8 = (7 + 4 + 10 + x) / 4

Using inverse operations, we will find that all the values must add up to 32 because 32 / 4 = 8.

(21 + x) / 4 = 8

32 - 21 = 11

Hence, x = 11.