BASIC PROBABILITY

Vocabulary

100

This is the likelihood of an event occurring. 

a. chance 

b. probability 

c. percent 

d. independent

What is probability?

200

This the result of an event. 

a. dependent 

b. event 

c. outcome 

d. chance

What is outcome?

300

The outcome you want is this. 

a. favorable 

b. probability 

c. independent 

d. wanted

What is favorable?

400

Name a way to represent probability.

What is a fraction, decimal, or percentage?

500

Describe the outcomes of these two events: a) flipping a coin b) spinning a spinner with equal sections of red, blue, green, yellow and orange. How many outcomes are there for each event?

a) You could toss heads or tails; two outcomes b) You could spin red, blue, green, yellow or orange; five outcomes

Basic Probability

100

This is the probability, in simplest form, of rolling an even number on a die 

What is 1/2?

200

You and four friends order food at a restaurant. This is the probability that your food will be served first.

What is 1/5?

300

This is the probability, in simplest form, of rolling greater than 2 on a ten-sided die numbered 1-10.

What is 4/5?

400

A bag has seven Snickers and three Milky Way bars. This the probability of pulling out a Snickers?

What is 7/10?

500

The letters A through I are placed in a bag. This is the probability of drawing D.

What is 1/9?

Predictions Using Probabilities

100

Of 10 people at the park, 4 really like the new playground. Use the information to predict how many out of 100 people would really like the new playground.

40 out of 100 people

200

If 12 people out of 50 saw the new movie with Denzel Washington, how many people out of 1,000 would you expect to see the movie?

240

300

If 14 of 40 students are interested in participating in athletics, how many out of 420 would you expect to be interested in athletics?

The ratio 14/40 is equal to the ratio x/420; where x equals the number of students your would expect to be interested in athletics. Solve the ratio and you get the answer! 147 students would be interesting in athletics

400

For every 75 light bulbs produced at a factory, 2 are defective. In a box of 300 light bulbs, how many would likely be defective?

Ratio 2/75 = x/300 Solve the ratio and you get 8 defective light bulbs.

500

At the school carnival, Jesse won the balloon dart game 1 out of every 5 times he played. If he plays another 15 times, about how many times can he expect to win?

3

Probabilities in Percent Form

100

This percent represents the probability of rolling a 3 on a ten-sided die.

What is 10%?

200

On a spinner with blue, yellow, green, and red sections, this percent represents the probability of spinning blue.

What is 25%

300

This percent represents the probability of not spinning orange on a spinner with yellow, green, orange, and red sections.

What is 75%

400

This percent represents the probability of drawing a green marble from a bag with 9 green and 11 black marbles.

What is 45%

500

This percent represents the probability of rolling a 7 on a standard die 

What is 0%?