Probability

Question 1

Independent if…

Answer 1

P(A∩B) = P(A) X P(B)

P(A|B) = P(A)

Question 2

Mutually exclusive if…

Answer 2

P(A∩B) = 0

P(A∪B) = P(A) + P(B)

Question 3

Probability addition rule

Answer 3

P(A∪B) = P(A) + P(B) - P(A∩B)

Question 4

3 events all mutually exclusive

Answer 4

P(A∪B∪C) = P(A) + P(B) + P(C) - P(A∩C) - P(B∩C)

Question 5

when probability missing in middle section of venn diagram?

Answer 5

add up all frequencies for all events (including none) - the total frequency