Probability Practice

Nmne: _

1. A cup has some coins in it.

Esther's Coins

Type ofCoin

Number ofCoins

penny 3->-------f-------------j

nickel 5

dime 2'''.-.· ....• ·... ~·.~..··_4·..·"·····.··_

Iqua-rter

The cup tips over and 1 coin falls out. What isthe probability of a penny falling out?

3TI D. 1

3'14

1TI B. c.A.

2. Julie had a bag of candy. There were 6 strawberry~. candies and 4 cherry candies in the bag. Julie

closed her eyes and picked a candy. What is theprobability she picked a cherry candy?

25 D. 2

3'1TO

14B. c.A.

3. Haley had 20 different-colored rubber ducks. Shehad 12 yellow ducks, 3 black ducks, and 5 orangeducks. She picked 1 duck without looking. Whatis the probability Haley picked a yellow duck?

25 D. 3

51

2013' c.A. B.

page 1

Date:

4. Mary Beth had a bag with 25 colored beads.There were 5 different colors and 5 beads of eachcolor. Mary Beth drew a bead from the bag andreplaced it 30 times and recorded the results.

Beads Drawn from a Ba_g

B> - d C J Number of> ea 0 or Times Drawn

red 6

blue 5

yellow 5

green 7

purple 7

What are the experimental and theoreticalprobabilities that Mary Beth will draw a blue beadwhen she tries again?

A. theoretical probability 1. experimental5 '

probability = iB. theoretical probability

1.experimental5'

probability = ioc. theoretical probability

1.experimental6'

probability = ~

D. theoretical probability 1. experimental6 '

probability = io

5. Andrew has a bag with 100 cards each markedwith a letter. There are 10 cards in the bag thatare marked with the letter E. Andrew picks 1 cardat random from the bag. He pulls a card with theletter E and does not put it back. What is theprobability that the next card Andrew selects willbe marked with the letter E? Show all of yourwork or explain your thinking even if you usemental math.

Answer:

6. Gavin drew blocks at random from a bag for aprobability experiment and returned the block tothe bag after each draw. The table below showshis results.

page 2

9. Karina and Michael decided to spin the arrow onthe spinner below to determine who would wintheir game.

Which of the following describes a rule that is fairto both students?

A. Spin a 1, 2, or 3 -Karina winsSpin a 4, 5, 6, 7, or 8 -Michael wins

B. Spin a 1, 3, 5, 7, or 8 -Karina winsSpin a 2, 4, or 6 -Michael wins.

C. Spin a 1 or 2 -Karina wins.Spin any other number Michael wins.

D. Spin an even number -Karina wins.Spin an odd number -Michael wins.

10. A color tile will be taken at random from a bag~at contains 2 blue tiles, 5 red tiles, and 4 greentiles. What is the probability that the tile will begreen?

ITO

I<[

411 D. 4

"1

He plans to complete an additional 30 draws.How many green blocks should Gavin expect todraw in the next 30 draws?

A. 4 B. 12 C. 16 D. 18

A. B. c.

Probability Practice

7. Rachel put 3 red marbles, 2 blue marbles, 1 yellowmarble, and 1 green marble into a bag as shownbelow. All the marbles were the same shape andsize.

Without looking Rachel pulled 2 marbles out ofthe bag. Which of the following could she havepulled?

A. green, green B. yellow, orange

C. blue, black D. red, red

8. A number cube is labeled with the digits 1through 6. The cube is tossed once. What is theprobability that the cube will land on either a 4 ora 6?

A. 12

c.13

14

D.16

B.

11. Marissa and Jimena each conducted 75 trials ofthe same experiment at the miniature golf course.

• The bucket had only green, red, andyellow golf balls.

• Each girl randomly selected golf ballsfrom a bucket.

• Each girl recorded the color of the golfball, replaced it, and then chose anothergolf ball.

ResultsName Green Red Yellow !

i

Marissa 30 38 7 IJimena 29 36 10 I

Which statement is best supported by these results?

A. There are more green balls in the bucket thanyellow balls.

B. There are twice as many red balls in thebucket than green balls.

C. There is the same number of green, red, andyellow balls in the bucket.

D. There is the same number of green and redballs in the bucket.

12. Alyce has 36 marbles in a bag, all the samesize and shape. There are 12 red, 14 blue, and10 yellow marbles in the bag. She will select amarble from the bag at random.

What is the probability that the marble Alyceselects will be red?

718 D. 5

18I3

I36 c.B.A.

page 3

13. In a cafeteria survey, 300 students chose onefavorite lunch from 4 choices. The probability thata randomly selected student chose pizza was 0.25.Which data set supports this conclusion?

A. Lunch

NumberChOOSing

75 100

Burrito Pizza

100 25

Salad I Sandwich

Lunch Burrito Pizza Salad i Sandwich

Number 75 30 100 I 95Choosing

B.

c. I

Lunch Burrito Pizza Salad I SandvvichNumber 60 75 60 I 105Choosing

D. Lunch Burrito Pizza Salad ! Sandwich

NumberSO 120 60 I 70Choosing

14. Phan placed these animal cards into a bag.

What is the probability that she will draw a cardwith a tiger?

A. I9

B. 29

c. 39

49D.

Probability Practice

· 15. The table shows how many T-shirts of each colorPaul has in his closet.

Color Numberof Shirts

Green 3

Red 4

White 5

Blue 8

Total 20

If Paul chooses a 'f-shirt without looking, what isthe probability that it will be blue?

A. 4% B. 8% C. 40% D. 60%

16. Mason has 10 black, 12 white, and 3 brown pairsof socks in one drawer. What is the probabilitythat, without looking, Mason will pick a brownpair of socks from the drawer?

A. 4% C. 14% D. 33:~.%B. 12%

17. Study the spinner with 5 evenly spaced numbers,shown below.

Spinner

What is the probability of spinning the arrow andlanding on 5?

14 D. 5

TA. 25% B. 0.20

page 4

18. A bag contains 2 green cubes, 3 blue cubes, and5 red cubes. Nick places his hand in the bagand picks a cube without looking. What is theprobability that he picks either a blue or a redcube?

1:5

1'2

2:3 D. 4:5A. B. c.

19. The table below shows the number of coloredmarbles Maury has in his collection.

Marble Collection

Color Number of Marbles

Purple 13

Blue 34

Red 30

Green 23

If Maury picks a marble without looking, what isthe probability he will pick a blue marble?

Answer _

Show your work or explain how you determinedyour answer.

20. Homework Probability

While teaching probability to his class, Mr. Lopezgives a choice of two options.

OPTION A: The class gets homework every other class.

OPTION B: Mr. Lopez will roll two dice. If the sum of the numbers on the dice isless dum 7. the class will get homework.

Which option would you choose to ensure that youare assigned the least amount of homework if thethere are 24 classes? Explain how you made yourdecision.

Probability Practice