Bluebook SAT Test Probability and Conditional Probability 2

Question 1

A spinner has 8 equal sections numbered 1–8. What is the probability of landing on a prime number?

Accepted Answer

1/2

Answer

3/8

Answer

5/8

Answer

1/4

Question 2

Of 500 adults surveyed, 300 exercise regularly and 200 do not. Among those who exercise, 240 reported good health; among those who don't, 60 reported good health. What is the probability that a randomly selected adult who reports good health exercises regularly?

Accepted Answer

4/5

Answer

3/5

Answer

2/3

Answer

3/4

Question 3

A box contains 5 defective and 15 non-defective items. Two items are selected at random without replacement. What is the probability that the first is defective and the second is non-defective?

Accepted Answer

15/76

Answer

1/4

Answer

3/19

Answer

5/16

Question 4

In a group of 80 people, 50 drink coffee and 40 drink tea. If the probability of drinking both is 0.25, how many people drink coffee or tea?

Accepted Answer

70

Answer

50

Answer

60

Answer

80

Question 5

The two-way table shows 400 students categorized by grade and club membership.

In Club  Not in Club
Grade 9-10       80          120
Grade 11-12     100          100

A student is chosen at random. What is the probability the student is in a club, given they are in Grade 11–12?

Accepted Answer

1/2

Answer

2/5

Answer

3/5

Answer

1/4

Question 6

A coin is flipped 3 times. What is the probability of getting exactly 2 heads?

Accepted Answer

3/8

Answer

1/2

Answer

1/4

Answer

1/8

Question 7

A card is drawn from a standard 52-card deck. What is the probability it is a heart OR a king?

Accepted Answer

4/13

Answer

17/52

Answer

16/52

Answer

1/4