The arithmetic average of 10 numbers - 2, - 5,-2, 5, x, - 3 10, 3, 8, - 10 is 8 find x

AS

Arithmetic average = Sum of all the numbers / Total numbers

SO arithmetic average = { (-2) + (-5) + (-2) + (5) + (x) + (-3) + (10) + (3) + (8) + (-10) } / 10

={4x} / 10

=0.4 x

As Given Arithmetic average = 8

so 0.4x = 8

Dividing 0.4 Both sides

0.4x/0.4 = 8/0.4

x = 20