

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


A. 
Each trial has exactly two outcomes. 


B. 
The outcomes of each trial must be dependent. 


C. 
There must be a fixed number of trials. 


D. 
The probabilities in each trial must be independent. 


Hint 


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


A. 

B. 



C. 

D. 



Hint 


3. 
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. 
0.53962 
B. 
0.5 


C. 
0.4996 
D. 
0.54432 


Hint 


4. 
A number cube is tossed four times. Find the probability that at least two 6s are tossed. 


A. 
0.1319 
B. 
0.1106 


C. 
0.1748 
D. 
0.0962 


Hint 


5. 
Eric guesses at all 8 questions on a true/false test. Find the probability that he got at least 6 correct. 


A. 
0.1353 
B. 
0.1445 


C. 
0.1618 
D. 
0.1528 


Hint 

