Probability w/ Models and Words

Probability with Models and Words

Getting Started

Pocket Probabilities

1.

Complete the table. Use a fraction to represent each probability.

Molly has a number of rubber bands in her pocket that are the same size and shape.
She has 3 red, 4 yellow, 3 blue, and 2 green rubber bands. Molly takes one rubber
band out of her pocket and hides it in the palm of her hand. She wants her best friend
to guess which color of rubber band she is holding.

A uniform probability model occurs when all the probabilities in a probability model
are equally likely to occur. Each color card in the magicians’ trick had the same
probability of being chosen.

When all probabilities in a probability model are not equal to each other, you call it a
non-uniform probability model. An example would be a weather forecast that states
there is a 30 percent chance of rain. That means there is a 70 percent chance of not
raining. The sum of these two probabilities is 1, but the outcomes do not have the
same probability.

Activity 1

Selecting a member of the Chess Club whose members are Sam, Martha,
Carol, Jon, Sally, Ron, and Simon

Activity 1

Multiple Choice

Is this a uniform or non-uniform probabilty model?

• uniform

• non-uniform

Use the probability model to calculate each probability.

P(8) = ______

P(number less than 8) = ______

P(even number) = ______

Activity 1

P(3 or 6) = ______

Multiple Choice

Is this a uniform or non-uniform probabilty model?

• uniform

• non-uniform

​Probability in Words

Multiple Choice

Is this a uniform or non-uniform probabilty model?

• uniform

• non-uniform

Multiple Choice

What is the chance you will get a green marble?

• impossible

• unlikely

• likely

• certain

Multiple Choice

What is the chance you will get a yellow marble?

• impossible

• unlikely

• likely

• certain

Multiple Choice

What is the chance you will get a purple marble?

• impossible

• unlikely

• likely

• certain

Multiple Choice

Is this a uniform or non-uniform probabilty model?

• uniform

• non-uniform

Multiple Choice

What is the chance you will get a green rock?

• impossible

• unlikely

• likely

• certain

Multiple Choice

What is the chance you will get a red rock?

• impossible

• unlikely

• likely

• certain

Multiple Choice

What is the P( not purple) on this spinner?

• 2/5

• 1/5

• 4/5

• 3/5

Multiple Choice

What is the probability of spinning green?

• 0

• 1/4

• 1/2

• 3/4

Multiple Choice

What is the probability of spinning red?

• 0

• 5/12

• 1/2

• 3/4

Multiple Choice

What is the probability of spinning green or blue?

• 0

• 5/12

• 1/2

• 3/4

Multiple Choice

The chart below represents the number of marbles in a jar.

P(green) =

• 5/19

• 1/5

• 5/14

Multiple Choice

If you choose from the following M & M colors, what is the probability that you choose blue?

5 green

6 yellow

8 blue

7 brown

• 1/4

• 4/13

• 8/25

• 1/3