Probability practice questions

Select all of the events that are likely.

• There is a 30% chance of snow tomorrow.

• There is a 7 out of 8 chance you will win a prize.

• There is a 50% chance that a coin will land on heads.

• There are 3 ways out of 4 to win.

• There is an 8/12 chance that the name of a month will have an "r"

Tags

CCSS.7.SP.C.5

In class, Mr. Scott calls students to answer questions. The probabilities that given students will be selected are: ● P(Jim) = 0.65 ● P(Pam) = 0.02 ● P(Dwight) = 0.06 ● P(Creed) = 0.27 Which statements are true?

• It is very likely that Creed will be chosen.

• The least likely person to be chosen is Dwight.

• Dwight is four times as likely to be chosen as Pam.

• The most likely person to be chosen is Jim.

• It is unlikely that Pam will be chosen.

Tags

CCSS.7.SP.C.5

Kelly bought a “trick” coin that lands on tails with a probability of 0.8. Which frequency table would Kelly most likely generate by flipping the coin many times?

• Heads - 12; Tails - 36

• Heads - 6; Tails - 24

• Heads - 10; Tails - 32

• Heads - 8; Tails - 40

Tags

CCSS.7.SP.C.6

This table shows outcomes of a spinner with 3 equal sections colored red, white, and blue.

Red - 40; White - 24; Blue - 36

Based on the outcomes, which number is the best prediction for the number of times the arrow is expected to land on the blue section if it is spun 25 times?

• 10

• 9

• 16

• 12

Tags

CCSS.7.SP.C.6

A photographer checked 100 photos he took and found that 12 of them were blurry. What is the experimental probability of the photos NOT being blurry?

• 12%

• 0.88

• 6/50

• 24%

Tags

CCSS.7.SP.C.6

The probability that the cafeteria has green beans for lunch is 4/6 , and that ice cream is available is 1/2. Stanley wants to know the probability that both green beans and ice cream are available. He conducts a simulation by rolling a die and flipping a coin, where rolling a 1, 2, 3, or 4 on the die represents green beans being available and flipping tails (T) on the coin represents ice cream being available. The results of 15 trials of the simulation are listed below.

2H 5T 4H 3T 6T 1T 2H 4H 4T 6H 4T 2H 6T 3H 2T

Based on the results of this simulation, what is the probability that both green beans and ice cream are available for lunch?

• 2/5

• 1/3

• 7/15

• 2/3

Tags

CCSS.7.SP.C.8C

Of the 24 students in Gabe's class, 6 like math the most, 9 like ELA, 5 like science and 4 like social studies. Gabe created a spinner that represents the breakdown of the students' favorite subjects. He spun the spinner 25 times and recorded the results below.

Math - 4; ELA - 8; Science - 10; Social Studies - 3

What is the experimental probability of the spinner landing on science?

• 1/3

• 5/12

• 2/5

• 3/8

Tags

CCSS.7.SP.C.6

Oscar belongs to a club that is performing at a concert. Each member of the club needs to wear one of the shirts listed below.

T-shirts: Orange - 12; Green - 8; White - 10

Dress shirts: Orange - 8; Green - 8; White - 4

Oscar chooses the first shirt at random from all the shirts. What is the probability the shirt Oscar chooses is orange?

• 3/5

• 2/5

• 2/3

• 1/2

Tags

CCSS.7.SP.C.7B

Scranton Middle School has the following lunch options:

Main course - pizza or hamburger

Side dish - applesauce or carrots

Dessert - cookie, brownie or popsicle

You can choose 1 main course, 1 side and 1 dessert. Create a sample space for all possible lunch combinations, then determine what is the probability that you will get carrots or cookie if your lunch selections were made at random?

• 2/3

• 3/4

• 1/2

• 1/3

Tags

CCSS.7.SP.C.8B