Unformatted text preview: Probability Copyright © 2006, Barry Mabillard.
Probability Standards Test – Practice Exam 0 www.math40s.com
www.math40s.com 1. In a Manitoba school, 10% of the students were born in Saskatchewan, 75% were born
in Manitoba, and the rest were born in Ontario. John decides to run for student president.
The results of the election are as follows:
35% of the students born in Saskatchewan voted for John.
70% of the students born in Manitoba voted for John.
25% of the students born in Ontario voted for John.
a) What is the probability a student born in Manitoba did not vote for John? b) If a student voted for John, what is the probability the student was born in Manitoba? 2. The probability of rolling a five on a sixsided die is 1
. Therefore, the probability of
6 1
. If a sixsided die is rolled three times, what is the
216
probability of not rolling three consecutive five’s?
rolling three consecutive five’s is Probability Standards Test – Practice Exam 1 www.math40s.com 3. A box contains 3 orange, 2 blue, and 3 purple marbles. If a marble is randomly
selected from the box, determine the probability it is not purple. 4. Bag A contains four metal balls and six glass balls, and Bag B contains five metal balls
and two glass balls. A ball is randomly selected from Bag A and placed in Bag B. A ball is then pulled
at random out of Bag B. Determine the probability that the ball from Bag B is metal. Probability Standards Test – Practice Exam 2 www.math40s.com 5. Jim and Mary share the job of washing the windows in their house. Jim washes the
windows 45% of the time, and Mary washes the windows 55% of the time.
The probability of streaks being left on the window is 40% when Jim cleans the windows,
and 35% when Mary cleans the windows. A visitor to the house notices streaks on the
window. The probability Mary washed the windows that day is 6. The probability Kristen brings a soft drink to school is 0.3. The probability she brings a
chocolate bar to school is 0.35. If the events are independent, what is the probability she
brings both a soft drink and a candy bar to school? 7. A student writes letters of the alphabet on some cards and places those cards in two
different bags. The letters A, C, E, G, I are in Bag 1, and B, C, D, F, H, I are in Bag 2.
A card is randomly chosen from each bag. Determine the probability
a) Both cards are the same letter b) The cards are different letters Probability Standards Test – Practice Exam 3 www.math40s.com 8. Dave plays video games 40% of the time on his home console system, 25% of the time
on the computer, and 35% of the time on his cell phone. If he is playing on the computer,
there is a 70% chance he is playing an RPG (roleplaying game). If he is playing on his
console or cell phone, there is a 10% chance he is playing an RPG.
a) What is the probability Dave chooses to use his home console and then selects an RPG
to play? b) A friend comes over and finds Dave not playing an RPG. What is the probability he is
on the computer? 9. A number is randomly picked using Spinner 1, and another number is randomly picked
using Spinner 2. Probability Standards Test – Practice Exam 4 www.math40s.com 10. The probability that the first light bulb on a string of Christmas lights blinks is 0.4.
The probability the second light bulb blinks is 0.65. If the probabilities are independent,
determine the probability neither bulb blinks. 11. Bags 1 & 3 contains four metal balls (darker) and six glass balls (lighter).
Bag 2 contains five metal balls and two glass balls. In a game, a person rolls a die to determine which bag to pull a ball out of. If the die rolls
a 1, 2, or 3, the ball is pulled from Bag 1. If the die comes up 4 or 5, the ball is pulled
from Bag 2. If the die comes up 6, the ball is pulled from Bag 3. The probability of
selecting a metal ball is: 12. The probability a student has to perform in a violin recital next Wednesday is 0.7.
The probability the student has a hockey game that same night is 0.6. The events are
independent.
a) Determine the probability the student will have to attend both events next Wednesday. b) Determine the probability the student will have to attend one event or the other next
Wednesday. Probability Standards Test – Practice Exam 5 www.math40s.com 13. In a junior football league, 55% of the players come from Western Canada and 45%
are from Eastern Canada. From this league, 17% of the Western players and 11% of the
Eastern players will go on to the CFL. The following diagram contains the results: If a randomly chosen CFL player who came from the junior league is selected, the
probability he came from Eastern Canada is: Probability Standards Test – Practice Exam 6 www.math40s.com 14. A student randomly selects a marble from of the boxes below.
Box 1
2 metal
2 glass Box 2
3 metal
2 glass Box 3
2 metal
4 glass Given that a metal marble is selected, determine the probability it came from Box 3. 15. Box A contains 3 blue and 2 yellow balls, and Box B contains 3 blue and 3 yellow
balls. A ball is pulled from Box A, then a ball is pulled from Box B. The probability both
balls are the same color is 16. Seven people are randomly selected from a group of 10 men and 11 women to form a
committee. The probability exactly 5 males are on the committee is Probability Standards Test – Practice Exam 7 www.math40s.com 17. The probability Chelsea wears a blue coat is 0.32. The probability Chelsea goes to the
movies is 0.4. Determine the probability Chelsea goes to the movies but does not wear
her blue coat. 18. Clarissa, Liz, and Jon sell luggage. Clarissa sells 40% of the luggage, Liz sells 35%
of the luggage, and Jon sells 25% of the luggage. Of the luggage Clarissa sells, 32% have
a sticker price over $300. Of the luggage Liz sells, 28% have a sticker price over $300.
Of the luggage Jon sells, 47% has a sticker value over $300.
If a piece of luggage over $300 is sold, what is the probability it was sold by Clarissa? 19. If four coins are tossed, determine the probability all four will come up heads. 1
3
. The probability Adam scores a goal is . If
3
7
Steve and Adam each take one shot at the net, what is the probability they both miss?
20. The probability Steve scores a goal is Probability Standards Test – Practice Exam 8 www.math40s.com 22. A unique tetrahedral die has one side marked 1, two sides marked 2, and one side
marked 3.
a) What is the sample space for this die? b) If the die is thrown twice, determine the probability the sum is even. 23. A student council consisting of eight people is to be randomly chosen from a group of
12 students. Brittany, Elisha, and Gwen are three of the twelve students. Determine the
probability that Brittany, Elisha, and Gwen are on the student council. Probability Standards Test – Practice Exam 9 www.math40s.com 24. There are 7 men and 9 women available for selection to a committee. Two of the men
and one of the women are good friends. If the committee requires three men and
4 women, what is the probability that all three friends will be on the same committee? Probability Standards Test – Practice Exam 10 www.math40s.com ...
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This note was uploaded on 03/02/2012 for the course SCIENCE 1120 taught by Professor A.young during the Spring '12 term at Canadian University College.
 Spring '12
 A.Young
 Biology

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