Probability

Question 1

Basic formula for probability

Answer 1

Favorable outcomes/Total outcomes

Question 2

Complementary events

Answer 2

P(A) + P(Not A)=1

Question 3

P(A and B)

Answer 3

Independent: P(A) x P(B)
Dependent: P(A) x P(A/B)

Question 4

P(A or B)

Answer 4

P(A) + P(B) if mutually exclusive
P(A) + P(B) - P(A and B) if not

Question 5

Probability of “at least one”

Answer 5

1 - P(ninguno)