Five-Minute Check (over Lesson 15–1)

Main Idea and Vocabulary

Key Concept: Probability

Example 1:Use Fractions to Describe Probability

Example 2:Real-World Example

Make a Prediction

• I will use fractions to describe probability.

• favorable outcome

Use Fractions to Describe Probability

One marble is chosen from the bag. Find the probability that a red marble is chosen.

Use Fractions to Describe Probability

P(event) =number of favorable outcomesnumber of possible outcomes

P(red) = 616

P(red) = 38

number of red marblestotal number of marbles

Simplify.

Answer: So, the probability of choosing a red

marble is .38

1. A

2. B

3. C

4. D

0% 0%0%0%

B. 18

One marble is chosen from the bag. Find the probability that a blue marble is chosen.

D. 416

A. 38

C. 12

Jamal is making a beaded belt. Each packet of beads comes in the colors shown in the table. If Jamal takes one bead without looking, what is the probability that he gets a blue or green bead?

There are 12 + 18 + 24 + 6 or 60 beads in all. There are 18 + 24 or 42 beads that are either blue or green.

P(event) =number of favorable outcomesnumber of possible outcomes

P(blue or green) =18 + 24

12 + 18 + 24 + 6

=4260

=7

10

blue or green beadstotal number of beads

Add.

Simplify.

Answer: So, the probability that Jamal will get a blue

or green bead is .7

10

1. A

2. B

3. C

4. D0% 0%0%0%

Looking at the chart below, what is the probability of picking a red or a yellow bead at random?

B. 58

D. 310

A. 38

C. 18

End of the Lesson

Five-Minute Check (over Lesson 15–1)

Image Bank

Math Tool Chest

Make a Prediction

1. A

2. B

3. C

4. D

5. E

A B C D E

0% 0% 0%0%0%

(over Lesson 15–1)

One card is drawn without looking. Describe the probability of drawing an even number rather than an odd number.

A. impossible

B. likely

C. equally likely

D. unlikely

E. certain

1. A

2. B

3. C

4. D

5. E

0% 0% 0%0%0%

(over Lesson 15–1)

One card is drawn without looking. Describe the probability of drawing 5 rather than 8.

A. impossible

B. likely

C. equally likely

D. unlikely

E. certain

1. A

2. B

3. C

4. D

5. E

(over Lesson 15–1)

One card is drawn without looking. Describe the probability of drawing 2 rather than 7.

A. impossible

B. likely

C. equally likely

D. unlikely

E. certain

0% 0% 0%0%0%

1. A

2. B

3. C

4. D

5. E

(over Lesson 15–1)

One card is drawn without looking. Describe the probability of drawing 9.

A. impossible

B. likely

C. equally likely

D. unlikely

E. certain

0% 0% 0%0%0%

1. A

2. B

3. C

4. D

5. E

0% 0% 0%0%0%

(over Lesson 15–1)

One card is drawn without looking. Describe the probability of drawing an even or an odd number.

A. impossible

B. likely

C. equally likely

D. unlikely

E. certain