Grigori S. answered • 10/22/13

Tutor

New to Wyzant
Certified Physics and Math Teacher G.S.

The union probability of the events A and B is

P(A∪B) = P(A) + P(B) - P(A∩B) = 0.3 + 0.4 - P(A∩B) = 0.7 according to the text.

Thus, P(A∩B) = 0, or two events, A and B, do not intersect.

The probability of the compliment of A is 1 - P(A) = 0.7.