|
Unit Test #67
Select your answers to the following 5 questions from the pop-up menus in the right hand column. Clicking the "Begin Test Again" button will clear all the answers.
|
Q1:
|
X and Y are independent random variables with:
E(X) = 15 and E(Y) = 10
VAR(X) = 4 and VAR(Y) = 7
What is E(X + Y)?
|
A. 5
B. 3
C. 25
D. 125 |
Answer 1:
|
|
|
Q2:
|
In question 1, what is E(X - Y)? |
A. 5
B. 3
C. 25
D. 125 |
Answer 2:
|
|
|
Q3:
|
In question 1, what is VAR(X - Y)? |
A. -3
B. 3
C. 11
D. 25
|
Answer 3:
|
|
|
Q4:
|
In question 1, what is E(3X - 2Y)?
|
A. -3
B. 3
C. 11
D. 25 |
Answer 4:
|
|
|
Q5:
|
.
In question 1, what is SD(3X + 2Y)?
|
A. 25
B. 8
C. 64
D. 646 |
Answer 5:
|
|
|
