Name _______________________________ Date __________________________________
Copyright© 2006 McGraw-Hill Ryerson Limited, a subsidiary of the McGraw-Hill Companies. This page may be reproduced for classroom use by the purchaser of this book without the written permission of the publisher.
Extra Practice BLM 4GR Chapter 4 Get Ready Outcomes, Events, and Theoretical Probability 1. Each letter from the word “probability”
is written on a piece of paper and placed in a bag. You randomly draw a piece of paper out of the bag one at a time and return it to the bag after each draw. What is the probability of drawing
a) a consonant? ___________________
b) a vowel? ______________________
c) the letter b? ____________________
d) any letter? _____________________
e) the letter c? ____________________ 2. There are 18 cards in a bag, numbered
1–18. You randomly choose a card from the bag one at a time and return it to the bag after each choice. What is the probability of choosing
a) an even number? _______________
b) a prime number or 1? ____________
c) a perfect square? _______________
d) a multiple of 3? ________________ Complementary Events 3. Find the complementary events for
question 2. What is the probability of drawing
a) an odd number? ________________
b) a composite number? ____________
c) not a perfect square? ____________
d) any number not a multiple of three?
______________________________
e) Did you have to redo the questions or is there a quicker way to find the answers?
______________________________
______________________________ 4. a) There is an octahedral die (a die with
8 sides) with the numbers 1–8 on its sides.
What are the chances of tossing the die and showing the number 5? Give the possibilities in a fraction, decimal, and percent. ______________________________
______________________________ b) What are the chances of rolling any
other number? Write this number in two different ways. ______________________________
______________________________ c) What is the sum of the possibilities
of rolling each number? ______________________________
______________________________
Name _______________________________ Date __________________________________
Copyright© 2006 McGraw-Hill Ryerson Limited, a subsidiary of the McGraw-Hill Companies. This page may be reproduced for classroom use by the purchaser of this book without the written permission of the publisher.
5. A bag contains red, yellow, and white jellybeans. The probability of drawing a
yellow jellybean is
1
2 and a white is
1
6.
a) What is the probability of drawing a
red jellybean? Why?
______________________________
______________________________ b) How many jellybeans could there be
in the bag? Explain. ______________________________
______________________________ Trials and Experimental Probability 6. A gumball machine has blue, green, and
yellow gumballs in it. The following chart shows the results of 15 trials.
Colour Tally Frequency
Blue IIII II 7 Green II 2 Yellow IIII I 6
a) What is the probability of choosing
each colour in the machine?
______________________________
______________________________
______________________________ b) If the next ten trials produce another
3 green, 5 yellow, and 2 blue gumballs, how do the experimental probabilities of choosing each colour change?
______________________________
______________________________
______________________________
______________________________
c) What type of probability is this?
______________________________
______________________________
7. Cool Shoe Store is having a special sale
on footwear. If you buy one pair of sneakers or shoes, you get a free pair of socks: black, white, blue, or green. a) Draw a tree diagram of the
possibilities of sneakers, shoes, and socks.
b) Draw a table of possibilities of the
sneakers, shoes, and socks. c) What percent of the outcomes have a
black pair of socks? Give the answer as a decimal and as a fraction too.
______________________________
______________________________ d) What percent of the outcomes have a
pair of sneakers and any colour of socks? Give the answer as a decimal and as a fraction too.
______________________________
______________________________