Probability and Statistics Quiz

Harris works at a used car dealership. He makes sure all the cars have safe tires. In August, 36 of the used cars entering the dealership already have safe tires. Based on this result, he predicts that if 200 used cars entered the dealership, 150 of the cars would have safe tires. How many used cars entered the dealership in August? Record your answer on the grid. Then fill in the bubbles.

(a)  

Tags

CCSS.7.RP.A.3

Which probabilities are very likely? Choose all the correct answers.

• E) 15/35

• D) 6/7

• C) 3/6

• B) 8/9

• A) 1/5

Tags

CCSS.7.SP.C.5

A clearance aisle at a clothing store has 16 T-shirts, 8 tank tops, 20 sweatshirts, and 4 pants. Teagan picks a piece of clothing at random from the aisle. Which statement about the clearance aisle is true?

• A) The probability of picking a T-shirt is 2/3

• B) The probability of picking a sweatshirt is 5/16

• C) The probability of picking a tank top is 1/6

• D) The probability of picking pants is 1/11

Tags

CCSS.7.SP.C.7B

Hektor makes raviolis. He sells orders with 4, 6, or 8 raviolis. The raviolis are filled with beef, squash, cheese, or lobster. The raviolis come with red, white, or pink sauce. What is the probability that a randomly chosen order includes lobster raviolis? Show your work.

• 1/12

• 1/36

• 1/4

• 3/36

Tags

CCSS.7.SP.C.8B

Levi has a container of 300 differently colored marbles. He chooses one marble at random, records the color of the marble, and puts the marble back in the container. He does this 9 times. The colors of the marbles Levi chooses are red, pink, pink, yellow, blue, red, yellow, pink, and blue. Use Levi’s results to predict about how many pink marbles Levi will select in the next 45 trials. Show your work.

(a)  

Tags

CCSS.7.SP.C.6

Pompea is rolling a standard number cube and spinning a spinner with the numbers 7–12. What is the probability that the roll and the spin will both be a multiple of 3? Show your work.

• 1/3

• 1/12

• 7/12

• 3/12

Benilda plays a spelling game. There are 24 consonant tiles and 12 vowel tiles. During each turn, Benilda selects a tile at random from a bag, then returns the tile to the bag. Benilda records the kind of tile she selects during each turn. In 12 turns, she selects 5 consonant tiles and 7 vowel tiles. Which statement about the probability of selecting a vowel tile is correct?

• A) The theoretical probability is less than 1/2, and the experimental probability is greater than 1/2.

• B) The theoretical probability is less than 1/2, and the experimental probability is less than 1/2.

• C) The theoretical probability is greater than 1/2, and the experimental probability is greater than 1/2.

• D) The theoretical probability is greater than 1/2, and the experimental probability is less than 1/2.

Lamar spins the spinner shown two times. Decide if each statement about the spinner's probability is true or false. Choose True or False for each statement.

• True

• False

Tags

CCSS.7.SP.C.5

Lamar spins the spinner shown two times. Decide if each statement about the spinner's probability is true or false. Choose True or False for each statement.

• True

• False

Tags

CCSS.7.SP.C.5

Jani rolls a number cube 12 times. The first 11 results are 1, 3, 6, 2, 2, 5, 1, 4, 3, 6, and 4. For all 12 rolls, the theoretical probability of rolling a number greater than 3 is equal to the experimental probability of rolling a number greater than 3. What numbers could be the result of the 12th roll? Explain your reasoning.