7th Grade Math

Extra Practice EP21

Extra Practice

Multi-Part Lesson 8-1: Probability

PART A PAGES 429–434

Use the spinner at the right to find each probability. Write as

3

2

8 1

7

6

5 4

a fraction in simplest form.

1. P(even number) 2. P(prime number)


2. P(factor of 12) 4. P(composite number)


3. P(greater than 10) 6. P(neither prime nor composite)

A package of balloons contains 5 green, 3 yellow, 4 red, and 8 pink balloons.

Suppose you reach in the package and choose one balloon at random. Find

the probability of each event. Write as a fraction in simplest form.

7. P(red balloon) 8. P(yellow balloon) 9. P(pink balloon)


8. P(orange balloon) 11. P(red or yellow balloon) 12. P(not green balloon)

PART B PAGES 435–439

For each situation, find the sample space using a tree diagram.

1. rolling 2 number cubes


2. choosing an ice cream cone from waffle, plain, or sugar and a flavor
   of ice cream from chocolate, vanilla, or strawberry


3. making a sandwich from white, wheat, or rye bread, cheddar or
   Swiss cheese, and ham, turkey, or roast beef


4. tossing a penny twice


5. choosing one math class from Algebra and Geometry and one
   foreign language class from French, Spanish, or Latin

PART C PAGES 440–443

Use the Fundamental Counting Principle to find the total number of

outcomes in each situation.

1. choosing a local phone number if the exchange is 398 and each of the
   four remaining digits is different


2. choosing a way to drive from Lodi to Akron if there are 5 roads that
   lead from Lodi to Miami, 3 roads that connect Miami to Niles, and 4
   highways that connect Niles to Akron


3. tossing a quarter, rolling a number cube, and tossing a dime


4. spinning the spinners shown below

A

D

C B

A

B

C

D

E

F

A

D

C B

EP2_EP36_ExtPract_M1_895130.indd EP21 1/6/10 11:46 AM