

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


A. 
The probabilities in each trial must be independent. 


B. 
Each trial has exactly two outcomes. 


C. 
The outcomes of each trial must be dependent. 


D. 
There must be a fixed number of trials. 


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. 
0.4996 


C. 
0.54432 
D. 
0.5 


Hint 


4. 
The probability of tossing a tail on a bent coin is . The coin is tossed 5 times. Find the probability of tossing exactly 3 tails. 


A. 
0.2906 
B. 
0.3292 


C. 
0.3114 
D. 
0.3028 


Hint 


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


A. 
0.1528 
B. 
0.1445 


C. 
0.1353 
D. 
0.1618 


Hint 

