Probability Study Guide

A laundry basket has 24 t-shirts in it. Four are navy, 12 are red, and the remaining are white. What is the probability of choosing a red shirt at random?

• 1/2

• 1/3

• 1/4

• 1/6

A laundry basket has 24 t-shirts in it. Four are navy, 12 are red, and the remaining are white. What is the probability of choosing a white shirt at random?

• 1/2

• 1/3

• 2/3

• 1/4

A laundry basket has 24 t-shirts in it. Four are navy, 12 are red, and the remaining are white. What is the probability of choosing a green shirt at random?

• 1/6

• 1/4

• 0

• 1/3

What is the theoretical probability of selecting the name Joey from the hat?

• 1/4

• 1/2

• 1/3

• 1/5

Based on the results in the table, what is the experimental probability of selecting the name Alex?

• 1/2

• 2/5

• 1/4

• 1/3

Students standing in line for lunch were surveyed about their favorite meal. If one student is picked randomly, which of the following is true?

• The student’s favorite meal is half as likely to be pizza than pasta.

• The student’s favorite meal is more likely to be fajitas than pizza.

• The student’s favorite meal is twice as likely to be pasta than pizza.

• The student’s favorite meal is twice as likely to be fajitas than pasta.

At a school assembly, four out of the first 10 students were wearing spirit wear. Based on this information, if 500 students were at the assembly, then how many students could be expected to have on spirit wear?

• 100

• 200

• 250

• 400

Each spinner shown below will be spun one time. Which of the following tree diagrams shows all of the possible outcomes when each spinner is spun once?

• Diagram A

• Diagram B

• Diagram C

• Diagram D

Joy can choose to ride the bus, the subway, or take a taxi to travel to work on Monday and Tuesday. Which list shows all the possible outcomes of one day and one method of travel?

• Monday, Bus; Tuesday, Taxi; Monday, Subway; Tuesday, Bus; Monday, Subway; Tuesday, Taxi

• Monday, Bus; Monday, Subway; Monday, Taxi; Tuesday, Bus; Tuesday, Subway; Tuesday, Taxi

• Bus, Taxi; Bus, Subway; Taxi, Bus; Taxi, Subway; Subway, Taxi; Subway, Bus

• Monday, Bus; Monday, Subway; Monday, Tuesday; Tuesday, Bus; Tuesday, Subway; Tuesday, Monday

The airport security randomly selected 24 suitcases from in the security line. Of these bags, they screened 7 suitcases. Based on this information, what is the most reasonable prediction for the number of suitcases they will screen in a group of 144?

• 24

• 36

• 42

• 48