Introduction to Probability Review

When figuring the probability of an event, what number goes on the bottom of your fraction?

• The number of the desired event

• The total number of choices

• The event that happens the most

• The even that happens the least

A coin has two sides (heads, tails). If you flip the coin, what is the probability you land on tails?

• 1/4

• 1/3

• 1/2

• 2/1

A spinner has 4 sections: 1 red, 1 blue, 1 green, 1 yellow. What is the probability that you spin and land on blue?

• 1/2

• 1/4

• 2/4

• 3/4

A bag has 10 marbles: 4 red, 2 green, 2 blue, 2 yellow. If you reach in the bag and pull out one marble, what is the probability it will be a blue marble?

• 4/10 or 2/5

• 2/10 or 1/5

• 10/10 or 1

• 0/10 or 0

A bag has 10 marbles: 4 red, 2 green, 2 blue, 2 yellow. If you reach in the bag and pull out one marble, what is the probability it will be an orange marble?

• 4/10 or 2/5

• 2/10 or 1/5

• 10/10 or 1

• 0/10 or 0

The probability of an event NOT happening is called ____.

• Compute

• Complement

• Completion

• Comparison

What is the probability of rolling a number cube and NOT landing on a 1?

• 1/6

• 2/6 or 1/3

• 5/6

• 6/6 or 1

A spinner has 4 sections: 1 green, 1 blue, and 2 yellow. What is the probability of spinning and NOT landing on yellow?

• 1/4

• 2/4 or 1/2

• 3/4

• 1/5

A bag has 7 marbles: 2 green, 2 blue, and 3 orange. What is the probability of reaching in and NOT pulling out a green?

• 2/7

• 3/7

• 4/7

• 5/7

What's the probability of choosing a red counter from this bag?

• 7/5

• 4/12

• 7/12

• 1/11