Unit 4 Review

There are 12 girls and 16 boys in Ms. boyd’s class. She randomly picks one of her students and gives that student a pack of stickers. What is the probability that she will randomly choose a girl to receive the stickers?

• 12/16

• 12/28

• 6/14

• 3/7

Mr. Mosley surveyed several high school students on the number of hours they spend exercising or playing video games a week and recorded that data on a dot plot. Which statement about the data is true?

• •The median of the exercise data is higher.

• •Half the students spend more than 4 hours exercising.

• •The mode for the exercise data is equal to the mode to the video games.

• •The median for the video game data is

  higher than the median for exercise data.

Which situation has a probability of 2/5?

• •Rolling an even number on a fair 6 sided number cube

• •Picking a vowel out of the word “PreAlgebra”

• •Picking Blue on the spinner to the right

• •Picking a multiple of 3 from a bag with cards

  numbered 1 – 10.

A fair 6-sided number cube is rolled 300 times. Which statement regarding the outcome of these rolls is most accurate?

• •The number 2 is more likely to be rolled than any other number on the number cube.

• •The number 2 will be rolled exactly 50 times during the experiment because theoretical and experimental probability are equal.

• •The number 4 is less likely to be rolled than any other number on the number cube.

• •The number 6 will theoretically be rolled 50 times, but will most likely not be rolled 50 times during the experiment.

The school cafeteria surveys random students about their favorite subject and records the data in the table. If there are 430 students in the school, approximately how many would be expected to choose science?

• 16/43

• 32/80

• 86/430

• 8/12

A bag contains 20 red marbles, 10 green marbles, and 60 yellow marbles. What is the probability that a ball chosen at random will be red?

• 1/3

• 2/9

• 1/4

• 1/2

Nicole’s bag contains 4 red marbles and 6 blue marbles. Nicole randomly selects a marble from the bag, records the color, and then puts the marble back in the bag. If she does this 100 times, how often is her selection likely to be red?

• •50 times

• •4 times

• •40 times

• •60 times

Look at the tree diagram below. What is the probability that you will choose water as your beverage?

• 1/3

• 1/2

• 2/7

• 3/10

Marne’ spins a spinner with 4 equally-sized, colored sections and also rolls a fair 6-sided number cube. Which statements are true?

• •The probability of rolling an even number is less than the probability of the spinner landing on orange.

• •The probability of rolling a 3 is equal to the probability of the spinner landing on red.

• •The probability of the spinner landing on red or green is equally likely as the number cube landing on an even number.

• •The probability of rolling an odd number is greater than the probability of landing on blue.

Find the first and third quartile of the data below. (you must put the data in order first!!)

24, 20, 18, 25, 22, 32, 30, 29, 35, 30, 28, 24, 38

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