Chapter 16 Probability

Question 1

What is the sum of probabilities of separate events?

Answer 1

P(A) + P(A’) = 1

Question 2

What is the formula for the probability of two mutually exclusive events?

Answer 2

P(A U B) = P(A) + P(B)

since P(A ∩ B) = 0

Question 3

What is the formula for the probability of two events that are not mutually exclusive?

Answer 3

P(A U B) = P(A) + P(B) - P(A ∩ B)

Question 4

What does n(A) represent?

Answer 4

n(A) is the number of ways that event A can occur.

Question 5

What does n(ℇ) represent?

Answer 5

n(ℇ) is the total number of ways that all possible events can occur.

Question 6

What is the formula for the probability of an event A?

Answer 6

P(A) = n(A) / n(ℇ)