Probability

A bag contains 5 blue marbles, 4 red marbles, and 3 orange marbles. Mrs. Cox picks one without looking, replaces it and picks another one. What is the probability that she picks two that are not orange? 

• 9/16
• 3/4
• 9/144
• 5/16

What is the probability of picking a blue marble, putting it back in the bag, then picking a red marble?

If you spin two times, what is the probability of landing on green both times?

A(n) _____________________ is all the possible outcomes of an experiment.

• sample space

• trial

• experiment

• event

What is the sample space for a standard six-sided die?

• 1, 2, 3, 4, 5, 6

• 6

• 6, 6, 6, 6, 6, 6

• 2, 3, 4, 5, 6

What is the sample space?

• 5

• orange, green, red, white, yellow

• orange, green, red, red, yellow, white

• 6

How many outcomes are in the sample space for tossing one coin?

• 1

• 2

• 4

• 8

You give the answer to a probability problem as 6/5. The teacher marks it wrong. Why?

• It should have been 5/6.

• It's not written as a percent.

• It's more than 1.

• It's not written as a decimal.

Which of these cannot be considered a probability of an outcome?

• 1/3

• -1/5

• 0.80

• 112%

• 1

Roll a die one time. Find P(rolling a 4).

• 1/4

• 2/3

• 1/6

• 1/2