Probability Unit Test Review

Leslie is a biologist. She is going to randomly select one animal from her lab to study. There are 5 salamanders, 3 crayfish, and 12 minnows in her lab.

What is P(salamander)?

**Write your answer as a percent**

Tags

CCSS.7.SP.C.7B

You roll a 6-sided die.

What is P(roll greater than 4)?

• 2/6

• 3/6

• 30%

• 50%

Tags

CCSS.7.SP.C.7B

Joel has an MP3 player called the Jumble. The Jumble randomly selects a song for the user to listen to. Joel's Jumble has 2 classical songs, 13 rock songs, and 5 rap songs on it.

What is (rock song or rap song)?

**Write your answer as a fraction**

Tags

CCSS.4.NF.B.4A

CCSS.4.NF.B.4B

You spin the spinner shown below once. Each sector shown has an equal area.

What is P(not squirrel)?

**Write your answer as a decimal**

Tags

CCSS.7.SP.C.7B

Both Felipe and Enzo forgot to study for their science test. The probability of Felipe passing the test is 0.19. The probability of Enzo passing the test is 1/4.

Which of these events is more likely?

• Felipe passes the test

• Enzo passes the test

• Neither. Both events are equally likely.

I am Pat, Good Legs Lance, and Colorado Bronze are horses in a horse race. Their probabilities of winning the race are as follows:

P(I Am Pat wins)= 3/10

P(Good Legs Lance wins)= 0.6

P(Colorado Bronze wins)= 10%

Put the events in order from least to most likely.

• Good Legs Lance, I am Pat, Colorado Bronze

• Colorado Bronze, I am Pat, Good Legs Lance

• Colorado Bronze, Good Legs Lance, I am Pat

• I am Pat, Colorado Bronze, Good Legs Lance

Tags

CCSS.7.SP.C.5

Joe and Maxine are playing a game where they flip a fair coin four times and try to predict the outcomes. Maxine thinks that the probability of getting all heads in the four flips is equal to the probability of getting no heads in the four flips. Joe disagrees. He thinks that the probability of getting all heads is greater.

The sample space of possible outcomes is listed below. H represents heads, and T represents tails.

Who is correct, Joe or Maxine?

• Joe is correct

• Maxine is correct

Tags

CCSS.7.SP.C.8B

A teacher randomly chooses a two-person team from a group of four students. The first person chosen will be the presenter and the second person will be the researcher. Two of the students, Amir and Aaron, are boys. The other two students, Caitlin and Deniz, are girls. All the possible outcomes of the team selection are listed below.

If we take outcomes 2,3,5,6,7,8,10, and 11 which of the statements below describe this subset?

Choose all answers that apply:

• The subset consists of all the teams made up of one boy and one girl.

• The subset consists of all the teams having a girl as the presenter and a boy as the researcher.

• The subset consists of all the teams not made up of all boys and not made up of all girls.

• The subset consists of all the teams made up of either all boys or all girls.

Tags

CCSS.7.SP.C.8B

If you flip three fair coins, what is the probability that you'll get all three heads?

**Write your answer as a fraction**

Tags

CCSS.7.SP.C.7A

Elizabeth lives in San Francisco and works in Mountain View. In the morning, she has 3 transportation options (take a bus, a cab, or a train) to work, and in the evening she has the same 3 choices for her trip home.

If Elizabeth randomly chooses her ride in the morning and in the evening, what is the probability that she'll use a cab exactly one time?

**Write your answer as a fraction**