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

total amount of money that he should pay if he has not used his duty free exemption is $98

step-by-step explanation:

given a united states citizen returning to the states declares the following items at the customs office: 3 shirts at $8.50 each 2 dresses at $27.50 each 1 pair of gold cuff links at $17.50 per pair. we have to find how much he pay

cost of 3 shirts if one cost at $8.50 is

cost of 2 dresses if one cost at $27.50 is  

cost of 1 pair of gold cuff at $17.50

so, total amount of money that he should pay if he has not used his duty free exemption is   $25.5+$55+$17.50=$98

idkit the do u know da way and ligma consumed ninja

step-by-step explanation: