Unit 8 Review

Akshay had a deck of cards numbered 1 to 20. He randomly chose a card from the deck. Find each probability for the card he chose.

a) P(not 10 through 15)

b) P(odd number)

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There are 2 red, 10 blue, and 8 green marbles in a bag. Diya reaches into the bag and chooses one marble. Which color has a 1/10 chance of being chosen? Explain how you know your answer is correct.

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Rangers wanted to estimate the total number of elk in a region of Montana. They tagged 12 elk and sent them back to the area. Two months later, the rangers observed 4 of the tagged elk out of 25 total elk observed. Estimate the size of the elk population in that region of Montana.

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If Cali rolls a number cube 36 times, how many times would you predict she rolls a 2?

• 9

• 4

• 6

• 8

Venkatesh interviewed classmates to determine their juice preference. He made the following pie chart. Find the probability that someone will prefer apple juice.

• 40%

• 70%

• 60%

• 20%

Shreyan polled 30 seventh graders. Twelve students said they would vote for Shyam in the upcoming election. There are 250 students who will vote in the election. How many votes do you predict Shyam will get?

• 60 votes

• 90 votes

• 100 votes

• 150 votes

You roll a number cube two times. Which of the theoretical probabilities are accurate? Select all that apply.

• P(5 then 3) = 1/36

• P(even number then 1) = 1/6

• P(1 then 7) = 1/2

• P(odd number then 2) = 1/12

• P(even number then the odd number) = 1/4

One hundred students were randomly surveyed regarding their eye color. There are 800 students in the school. The data is below. Which inference is the strongest?

• Students with blue eyes make up a large percent of the students.

• There are no students with green eyes.

• Most students at school have brown eyes.

• There are exactly twice as many students at school with brown eyes as with blue eyes.

Study the information in each table below. Make at least two inferences and explain your reasoning.

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Find the five-number summary for Dylan’s points scored in the twelve basketball games. 8, 14, 27, 24, 18, 15, 6, 30, 26, 17, 10, 21

• 6 ~ 12 ~ 17.5 ~ 25 ~ 30

• 6 ~ 12 ~ 18 ~ 25 ~ 30

• 6 ~ 25 ~ 17.5 ~ 12 ~ 30

• 30 ~ 12 ~ 17.5 ~ 25 ~ 6