

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


A. 
There must be a fixed number of trials. 


B. 
The probabilities in each trial must be independent. 


C. 
Each trial has exactly two outcomes. 


D. 
The outcomes of each trial must be dependent. 


Hint 


2. 
Francis guesses at all 6 true/false questions in a trivia game. What is the probability that he guesses correctly on at least 5 of the questions? 


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. 
0.5 
B. 
0.53962 


C. 
0.54432 
D. 
0.4996 


Hint 


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


A. 
0.1748 
B. 
0.1106 


C. 
0.1319 
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. 
0.1618 


C. 
0.1445 
D. 
0.1528 


Hint 

