Topic 7: Probability Study Guide

An event has a probability of 0.7. How would you describe the chances that this event occurs?

• Likely

• Unlikely

• Certain

• Impossible

Based on the probability given, which event would be MOST LIKELY to occur?

• 9%

• 0.09

• 0.9

• 0.85

A bag contains the following marbles

3 red 4 blue 2 green 1 purple

How would you describe the chances of selecting a BLUE marble?

• Certain

• Equally likely

• Likely

• Not likely

A bag contains the following marbles.

3 red 4 blue 2 green 1 purple

What is the PERCENT chance you select a GREEN marble?

• 30%

• 20%

• 10%

• 50%

The 7th and 8th grades are having a drawing. The total entries are below.

7th grade: 4 winners out of 150 students.

8th grade: 8 winners out of 350 students.

Which grade has a better chance of winning?

• 7th grade

• 8th grade

• They have equal chance.

• Neither class has any chance.

Using the spinner, find the probability of spinning GREEN.

• 0.25

• 1/8

• 0.75

• 20%

When a fair 6 sided die is rolled, find p(6).

• 20%

• 6/6

• 40%

• 1/6

When a fair 6 sided die is rolled find P(odd). Answer as a percent.

• 12%

• 50%

• 25%

• 75%

When a fair 6 sided die is rolled use the THEORETICAL PROBABILITY of rolling a 4 to predict the number of 4's rolled in 300 attempts.

• 75

• 50

• 60

• 40

The probability of making a 3 point shot is about 42%. How many shots would Dan expect to make this season if he attempted 90 shots?

• About 42

• About 50

• About 38

• About 45