

1. 
Which statement is not true for a binomial experiment? 


A. 
There must be a fixed number of trials. 


B. 
Each trial has exactly two outcomes. 


C. 
The outcomes of each trial must be dependent. 


D. 
The probabilities in each trial must be independent. 


Hint 


2. 
The probability of tossing a head on a bent coin is 25%. Find the probability of getting 3 heads if the coin is tossed three times. 


A. 

B. 



C. 

D. 



Hint 


3. 
Determine the probability of getting exactly 2 heads if 4 fair coins are tossed. 


A. 

B. 



C. 

D. 



Hint 


4. 
Kevin has an email account and checks his email several times per day. The probability of Kevin receiving an email from his friends is . Suppose he checks his email 6 times in a day. Find the probability that Kevin gets a message at least 4 of the times he checks his email throughout the day. 


A. 
0.54432 
B. 
0.53962 


C. 
0.4996 
D. 
0.5 


Hint 


5. 
Kathy guesses at all of the 10 questions on a multiple choice exam. Find the probability that she gets 3 questions correct if each question has 5 choices. 


A. 
0.1843 
B. 
0.2013 


C. 
0.1556 
D. 
0.1124 


Hint 

