Probability Review

A student will spin 2 spinners for an experiment in math class. The tree diagram pictured shows all possible outcomes of the experiement.

Which sample space is described by this tree diagram?

• {(1, red), (1, purple), (2, red), (2, purple)}

• {(1,1), (1,2), (1, red), (1, purple), (2, red), (2, purple), (2,1), (1,2)}

• {1, red), (1, red), (2, purple), (2, purple)}

• {(1, red), (2, purple), (red, purple), (purple, red), (2, red), (1 purple)}

Tags

CCSS.7.SP.C.8B

A classroom is arranged with 8 seats in the front row, 10 seats in the middle row, and 12 seats in the back row. The teachers randomly assigns seats to students as they enter the classroom. What is the probability that the first students who enters the classroom will be assigned a seat in the front row?

• 4/15

• 1/3

• 3/5

• 2/15

Tags

CCSS.HSS.CP.B.9

What is the probability of NOT landing on green? P(NOT green) = ?

• 0.25

• 0.75

• 0.33

• 0.67

Hannah is counting what flavor coffee customers pick at the store. The table pictured shows the results.

What is the probability that the next person picks vanilla coffee?

• 3/4

• 1/4

• 23/28

• 15/22

Tags

CCSS.1.MD.C.4

A box contains 8 chocolate donuts, 7 sugar donuts, and 5 glazed. You randomly choose 1 donut from the box. What is the probability you choose a glazed donut?

• 20%

• 25%

• 40%

• 33%

Tags

CCSS.7.SP.C.7B

The spinner has 8 congruent (equal) sections.

The spinner below is spun 120 times. What is a reasonable prediction for the number of times the spinner will land on an even number?

• 75

• 45

• 15

• 40

Tags

CCSS.7.SP.C.6

A number cube with faces labeled from 1 to 6 was rolled 20 times. Each time the number cube was rolled, the number showing on the top face was recorded. The table shows the results.

Based on these results, what is the experimental probability that the next time the number cube is rolled it will land with 2 or 6 showing on the top face?

• 2/5

• 3/20

• 1/3

• 3/5

Tags

CCSS.7.SP.C.6

Andrew has a bag of erasers. The table shows the amount of each color he has.

Andrew selects an eraser at random. Based on the info in the table, which of the following statements is TRUE?

• The eraser is more likely to be green than all other colors combined.

• The eraser is equally likely to be pink, white, orange, or green

• The eraser is twice as likely to be orange as it is to be pink.

• The eraser is 7 times as likely to be green as it is to be white.

Tags

CCSS.7.SP.C.5

A bag contains:

• 5 Chocolate

• 6 Vanilla

• 3 Mint

• 4 PB

• 2 Strawberry

An ice cream bar will be drawn from the bag and replaced 100 times. What is a reasonable prediction for the number of times Mint or PB will be selected from the bag?

• 35

• 14

• 65

• 7

Tags

CCSS.7.SP.C.6

Emma picks two balls at random without replacing them. Which expression best represents the probability that both balls are white?

• 4/8 x 4/8

• 4/8 x 3/8 =

• 4/8 x 3/7

• 4/8 x 4/7