Here are 10 values of a variable x. find the variance using the formula u=x-20
18.9
20.7
19.3
20.1
21.3
19.6
20.5
20.9
18.8
20.8

0.77

Step-by-step explanation:

What we must do is apply the formula they give us and then apply absolute value, add and find the mean of the result and that would be the variance, like this:

18.9 - 20 = -1.1 = 1.1

20.7 - 20 = 0.7 = 0.7

19.3 - 20 = -0.7 = 0.7

20.1 - 20 = 0.1 = 0.1

21.3 - 20 = 1.3 = 1.3

19.6 - 20 = -0.4 = 0.4

20.5 - 20 = 0.5 = 0.5

20.9 - 20 = 0.9 = 0.9

18.8 - 20 = -1.2 = 1.2

20.8 - 20 = 0.8 = 0.8

(1.1 + 0.7 + 0.7 + 0.1 + 1.3 + 0.4 + 0.5 + 0.9 + 1.2 + 0.8) / 10 = 0.77

That is, the variance is 0.77

2x^2+5x+17

your welcome. : )

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: