Probability and Inferences

A chance event with probability 1 is certain to happen.

If the probability that it will rain tomorrow is 1/5, what is the probability that it will not rain tomorrow?  

• 4/5

• 3/5

• 2/5

• 1/10

Vernon tossed a coin 20 times. The results were 8 heads and 12 tails.
What is the experimental probability of tossing heads?

• 1/8

• 2/5

• 1/2

• 3/5

A hat contains 3 blue and 5 black tickets.
​
​If one ticket is chosen at random from the hat, what is the probability that it is blue?

• 1/2

• 3/5

• 3

• 3/8

A high school athletic director wants to know what the best time would be to schedule practices for all of the sports teams. She surveys the girls' basketball team to get the players' input. Which statement describes the athletic director's sample?

• A

• B

• C

• D

Laura wants to determine if the 7�ℎ7th grade class wants to go on a field trip to an art museum, a concert, or a sporting event.
​Which sampling method would likely provide a representative sample of the population? 

• A

• B

• C

• D

What is the probability of landing on the color blue on the spinner?

• 3/3

• 1

• 3/12 or 1/4

• 3/9 or 1/3

A box has 3 lime, 5 grape, and 2 orange popsicles.

P(NOT lime) =

• 7/10

• 1/2

• 3/10

• 4/10

Of the 255 total freshman at the high school, a random sample was taken of 75 freshmen. They were asked which lunch they prefer. The results are in the table. Predict how many in the freshman class prefer second lunch. Round to the nearest person if necessary.

• 122

• 85

• 48

• 101

Of the 255 total freshman at the high school, a random sample was taken of 75 freshmen. They were asked which lunch they prefer. The results are in the table. Predict how many in the freshman class prefer first lunch. Round to the nearest person if necessary.

• 122

• 85

• 48

• 101