

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


A. 
The probabilities in each trial must be independent. 


B. 
The outcomes of each trial must be dependent. 


C. 
Each trial has exactly two outcomes. 


D. 
There must be a fixed number of trials. 


Hint 


2. 
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. 
0.4996 
B. 
0.53962 


C. 
0.54432 
D. 
0.5 


Hint 


3. 
A number cube is tossed four times. Find the probability that at least two 6s are tossed. 


A. 
0.1748 
B. 
0.1106 


C. 
0.0962 
D. 
0.1319 


Hint 


4. 
Eric guesses at all 8 questions on a true/false test. Find the probability that he got at least 6 correct. 


A. 
0.1445 
B. 
0.1618 


C. 
0.1353 
D. 
0.1528 


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. 
0.2013 
B. 
0.1124 


C. 
0.1556 
D. 
0.1843 


Hint 

