Probability Basics

What is the probability of rolling a 5 on a standard 6-sided number cube?

• 1/5

• 5/6

• 1/6

• 5

What is the probability of picking a red marble from a bag that contains 3 red marbles and 3 green marbles?

• 1/3

• 1/2

• 1

• 3

You pick a shirt from a bag containing 1 red, 1 green, 1 blue, and 1 yellow shirt. What is the probability of NOT picking blue?

• 1/4

• 2/4

• 3/4

• 0

What is the probability that you will have dinner in Australia tonight?

• 0

• 1/4

• 1/2

• 1

You have a bag of 3 yellow marbles and 2 red marbles. Are the probabilities uniform?

• Yes because they are equal

• No because they are equal

• Yes because they are NOT equal

• No because they are NOT equal

You flip a coin. What is the probability of getting heads?

• 0

• 25%

• 50%

• 100%

You spin a spinner with 4 equal sections labeled a, b, c, and d. Describe the likelihood of landing on any section.

• The chance of landing on each section is equal

• There is no chance of landing on any section

• There is a greater chance of landing on a vowel.

Out of 80 coin flips, how many tails would you expect?

• 1

• 25

• 40

• 80

Which probability is false?

• Flipping a coin and getting heads = 1/2

• Picking a letter in the alphabet randomly = 1/26

• Picking a diamond in a deck of cards = 1/3

If you flipped heads 3oo times out of 1000 flips, is this more or less than you expected?

• More because it's greater than 1/2

• Less because it's less than 1/2

• More because it's less than 1/2

• Less because it's greater than 1/2