Practice Exercises for Probability
Directions: Read each question below. Select your answer by clicking on its button. Feedback to your answer is provided in the RESULTS BOX. If you make a mistake, choose a different button.
1. 
Which of the following is an impossible event? 




2. 
Which of the following is the sample space for choosing a letter from the word LIBRARY? 




3. 
What is the probability that a single card chosen from a deck is not an ace? 




4. 
Which of the following is a certain event? 




5. 
There are 4 parents, 3 students and 6 teachers in a room. If a person is selected at random, what is the probability that it is a teacher or a student? 




6. 
In a high school computer class there are 15 juniors and 10 seniors. Four juniors and five seniors are boys. If a student is selected at random, then what is the probability of selecting a junior or a boy? 




7. 
A jar contains 5 red, 3 green, 2 purple and 4 yellow marbles. A marble is chosen at random from the jar. After replacing it, a second marble is chosen. What is the probability of choosing a purple and then a red marble? 




8. 
Three cards are chosen at random from a deck without replacement. What is the probability of choosing an eight, a seven and a six, in order? 




9. 
In a shipment of 25 DVD Players, 2 are defective. If 2 DVD Players are randomly selected and tested, what is the probability that both are defective if the first one is not replaced after it has been tested? 




10. 
In a school, 48% of the students take a foreign language class and 19% of students take both foreign language and technology. What is the probability that a student takes technology given that the students takes foreign language? (Round your answer to the nearest percent.) 



