Probability

Question 1

When are two events mutually exclusive?

Answer 1

only when P(A∩B) = 0

Question 2

When two events are mutually exclusive, what is P(A∪B)?

Answer 2

P(A∪B) = P(A) + P(B)

Question 3

What is P(A∪B)?

Answer 3

P(A∪B) = P(A) + P(B) - P(A∩B)

Question 4

What is the probability of A given B?

Answer 4

P(A∩B)
P(A|B) = ————–, if independent, then P(A|B) = P(A)
P(B)

Question 5

If two events are independent of eachother, what is P(A∩B)?

Answer 5

P(A∩B) = P(A) * P(B)