Name
Date
Class
Practice B
LESSON
10-5 Experimental Probability
Identify the sample space and the outcome shown for each experiment.
1. spinning a spinner
2. tossing two coins
(
4
sample space: { 1, 2, 3, 4, 5 };
sample space: HH, HT, TH, TT ;
outcome { 2 }
outcome HT Write impossible, unlikely, as likely as not, likely, or certain to
describe each event.
3. The mail was delivered before noon on 4 of the last 5 days.
The mail will be delivered before noon today.
4. Sean rolls a number cube and gets an even number.
likely
as likely as not
5. The pages of a book are numbered 1 ⫺ 350. Amelia begins
reading on page 400.
An experiment consists of rolling a standard number
cube. Use the results in the table to find the
experimental probability of each event.
3
___
6. rolling a 1
7. rolling a 5
8. not rolling a 3
9. not rolling a number less than 5
20
1
__
5
9
___
10
13
___
40
impossible
Outcome
1
6
2
7
3
4
4
10
5
8
6
5
10. A tire manufacturer checks 80 tires and finds 6 of them to be defective.
a. What is the experimental probability that a tire
chosen at random will be defective?
b. The factory makes 200 tires. Predict the number
of tires that are likely to be defective.
11. A safety commission tested 1500 electric scooters and found
that 15 of them had defective handles.
a. What is the experimental probability that a scooter will
have a defective handle?
b. The factory makes 40,000 scooters. Predict the number
of scooters that are likely to have defective handles.
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
a107c10-5_pr.indd 36
36
Frequency
7.5%
15
1%
400
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12/15/05 6:02:07 PM
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