Probability Review (updated)

A principal randomly chose 40 students from grade 5. Of these students, 9 were wearing watches. Based on this information, what is the most reasonable prediction of the number of students wearing watches in a group of 120 students from grade 5?

• 27

• 9

• 18

• 80

Tags

CCSS.7.RP.A.3

The sections of spinner below are shaded red, blue, or green. Out of 24 spins, how many times will the spinner land on blue or green? 

• 16

• 20

• 12

• 6

Tags

CCSS.7.SP.C.6

In a random survey of 50 students at Great Middle School, 32 said chocolate was their favorite flavor of yogurt. The school has 450 students. How many of them are likely to select chocolate as their favorite flavor? 

• 144

• 162

• 225

• 288

Tags

CCSS.7.RP.A.3

How could you simulate randomly choosing a shirt to wear out of 8 different choices?

• flip three coins

• roll a die

• spin a 5-sided spinner and flip a coin

• roll 2 dice

Tags

CCSS.7.SP.C.8C

The questions on a multiple choice test each have 6 answer choices. Which model can be used to simulate randomly selecting the correct answer on a 20 question multiple choice test?

• rolling a six-sided number cube 6 times

• rolling a six-sided number cube 20 times

• spinning a spinner with 4 equal sized sections 4 times

• choosing 1 marble in a bag of 20 different colored marbles

Tags

CCSS.7.SP.C.8C

If the probability of an event is 0.99, which of the following best describes the event?

• The event will never occur

• There is a small chance that the event will occur

• The event is likely to occur

• The event will definitely occur

Tags

CCSS.7.SP.C.5

A restaurant surveys customers with the following results: 8 pizzas, 12 hamburgers, 14 pastas, and 6 steaks. What is the experimental probability of pizza or steak?

P(pizza or steak)

• 20%

• 65%

• 50%

• 35%

Tags

CCSS.HSS.CP.B.7

The experimental probability that Jonah will catch a fly ball is equal to 7/8. About what percent of the time will Jonah catch a fly ball?

• 55%

• 66%

• 77%

• 88%

Tags

CCSS.7.SP.C.6

A bag contains 30 pieces of candy. There are 15 grape, 7 cherry, 3 lemon, 5 strawberry. What is the probability of drawing a lemon?

• 3

• 1/10

• 3/10

• 30%

Tags

CCSS.7.SP.C.7B

A bag contains 4 blue marbles, 6 green marbles and 3 yellow marbles. If two marbles are drawn at random from the bag.

What’s the probability of drawing a green marble, without replacing it, and then drawing a yellow marble?

• 3/25

• 9/25

• 3/26

• 9/26