Unit Test #65

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
1
2
3
P(X=x)
0.3
0.5
0.2

What is E(X)?

A. 1.2
B. 1.9
C. 0.5
D. 3.61

Answer 1:

 

 

Q2:

 

What is E(X2) from the distribution shown above?

A. 4.6
B. 4.1
C.4
D. 16.81

Answer 2:

 

 

Q3:

 

In question 1, what is the value of VAR(X) A. 0.49
B. 4.1
C. 0.7
D. 1

Answer 3:

 

 

Q4:

 

 

z
5
6
7
8
P(Z = z)
s
3s
4s
2s

What is the value of E(Z)?

A. 44.89
B. 2.6
C. 6.3
D. 6.7

Answer 4:

 

 

Q5:

 

In question 4, what is VAR(Z)?
A. 0.64
B. 0.7
C. 0.49
D. 0.81

Answer 5: