Practice Exercises: Probability Theory

Unit 6 > Lesson 10 of 12

1.	Which of the following is an impossible event?
	Choosing an odd number from 1 to 10. Getting an even number after rolling a single 6-sided die. Choosing a white marble from a jar of 25 green marbles.  None of the above. RESULTS BOX:

2.	Which of the following is the sample space for choosing a letter from the word LIBRARY?
	{I, A} {L, I, B, R, A, R, Y} {L, I, B, R, A, Y} None of the above. RESULTS BOX:

3.	What is the probability that a single card chosen from a deck is not an ace?
	None of the above. RESULTS BOX:

4.	Which of the following is a certain event?
	Choosing a teacher from a room full of students. Choosing an odd number from the numbers 1 to 10. Getting a 4 after rolling a single 6-sided die. None of the above. RESULTS BOX:

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?
	None of the above. RESULTS BOX:

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?
	None of the above. RESULTS BOX:

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?
	RESULTS BOX:

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?
	None of the above. RESULTS BOX:

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?
	None of the above. RESULTS BOX:

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.)
	67% 253% 40% None of the above. RESULTS BOX:

Lessons on Probability Introduction to Probability Certain and Impossible Events Sample Spaces The Complement of an Event Mutually Exclusive Events Addition Rules for Probability Independent Events Dependent Events Conditional Probability Practice Exercises Challenge Exercises Solutions

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