Name _______________________________ Date __________________________________

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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.

______________________________

______________________________