probability

“A survey was conducted to predict if high school students will eat food served in the cafeteria.

Which number is closest to the probability that a student will not eat food served in the school cafeteria, given that the student is in 10th grade?

• 0.11

• 0.20

• 0.43

• 0.75

Tags

CCSS.HSS.CP.A.4

Lisa wants to determine the number of people who have pets or kids. She adds 63 and 46, then subtracts 34. Which statement explains whether Lisa’s method is correct?

• Lisa’s method is correct because the people who have pets and kids should not be counted at all.

• Lisa’s method is correct because the people who have pets and kids should be counted exactly once.

• Lisa’s method is not correct because she is not counting the people who have pets and kids at all.

• Lisa’s method is not correct because she is not counting the people who have pets and kids twice.

Tags

CCSS.HSS.CP.B.7

A high school has 250 twelfth-grade students. The numbers of twelfth-grade students who were members of the track team and the band are described.

- 25 twelfth-grade students were members of the track team.

- 20 twelfth-grade students were members of the band.

- 5 twelfth-grade students were members of both the track team and the band.

If 1 twelfth-grade student from the high school is randomly selected, what is the probability that the student will be a member of the track team or a member of the band? (use venn diagram or two way table to help visualize this question)

• 0.14

• 0.16

• 0.18

• 0.20

Tags

CCSS.HSS.CP.B.7

A company assigns each employee a random 6-letter code, using the letters E, F, G, and H. Letters can be repeated. Which number is closest to the probability that an employee’s code will not contain the letter G?

• 0.18

• 0.25

• 0.75

• 0.82

Tags

CCSS.HSS.CP.B.9

A restaurant has 9 different types of fruit in the kitchen. The chef randomly chooses 3 fruits. What is the probability the chef will randomly choose an apple, a pear, and an orange?

• 1/504

• 1/84

• 1/6

• 1/3

Tags

CCSS.HSS.CP.B.9

Peter and Alex each flip a coin to see if it is fair. Peter flips the coin 10 times. Peter says the coin is not fair because 7 of the results are Tails. Alex flips the coin 100 times. Alex says the coin is not fair because 52 of the results are Tails. Which statement best describes Peter and Alex's conclusions?

• Peter’s conclusion is valid, but Alex’s conclusion is not valid.

• Alex’s conclusion is valid, but Peter’s conclusion is not valid.

• Both Alex’s and Peter’s conclusions are valid.

• Neither Alex’s nor Peter’s conclusion is valid.

Tags

CCSS.7.SP.A.2

I

A group of people were surveyed and asked whether they think they will become famous someday. The results are summarized in the table.

If a male from the survey is randomly selected, what is the probability he believes he will become famous?

• 25%

• 35%

• 44%

• 65%

Tags

CCSS.8.SP.A.4

Consider two events: going to the beach while on vacation and staying at a hotel while on vacation. Which statement is true about the relationship of the two events?

• If the probability of going to the beach is equal to the probability of staying at a hotel and going to the beach, then the two events are independent.

• If the probability of going to the beach is the same regardless of whether one is staying at a hotel, then the two events are independent.

• If the probability of going to the beach is equal to the probability of staying at a hotel, then the two events do not affect each other.

• If the probability of going to the beach is not equal to the probability of staying at a hotel, then the two events are dependent.

Tags

CCSS.HSS.CP.A.4

CCSS.HSS.CP.A.2

A counselor determined that 60% of the senior class had taken a precalculus course and that 15% of the senior class had taken both a precalculus course and a statistics course. What percentage of seniors who took a precalculus course also took a statistics course?

• 9%

• 25%

• 45%

• 75%

Tags

CCSS.8.SP.A.4

The faces of a fair number cube are labeled 1 through 6. The number cube is rolled once. A possible outcome is the event that the number 1 is rolled. Another possible outcome is the event that an even number is rolled. How many outcomes are not in either of these events?

• 0

• 1

• 2

• 4

Tags

CCSS.HSS.CP.A.1