Additional Rule Probability

A recent study of a metropolitan area found that 31% of people owned a SUV, 74% of people surveyed owned a car, and 10% owned both. What's the probability that a randomly chosen person owned a SUV or a car?

• 85%

• 95%

• 5%

• 15%

• A

• B

• C

• D

• A

• B

• C

• D

• A

• B

• C

• D

• A

• B

• C

• D

In the 10th grade Geometry classes, there are 60 boys and 70 girls. At this point in the semester, 12 boys and 14 girls have an A.

If a student is selected at random, what is the probability of choosing a boy or a student without an A?

• 0.75

• 0.89

• 0.10

• 1.26

In the 10^th grade Geometry classes, there are 60 boys and 70 girls. At this point in the semester, 12 boys and 14 girls have an A in Geometry. If a student is selected at random, what is the probability of selecting a girl or a student with an A?

• 0.63

• 0.74

• 0.11

• 0.06

Joe has a number cube with sides labeled 1 through 6. He rolls the number cube twice. What is the probability that the sum of the two rolls is greater than 8 or at least one of the rolls is a 5?

• 0.58

• 0.44

• 0.75

• 0.66

Each digit 0-9 is written on a card using red ink. Each digit 0-9 is also written on a card using green ink. All the cards are combined and a single card is drawn at random. What is the probability that the card has the digit written in red ink, the number 8, or the number 5?

• 0.29

• 0.75

• 0.60

• 0.50

John has seven keys on a ring. He gives these keys to his friend Robin and asks her to unlock a door. If two of the seven keys can unlock the door, what is the probability that Robin unlocks the door on exactly her third attempt?