Given the following information: P(A) = 0.58 P(B) = 0.34 P(A and B) = 0.12 P(B given A) = 0.21

Question

What is the probability of A or B? Round your answer to the nearest hundredth as needed

 .(A or B) = 

Answer 1

Use the Addition Rule.

P(A or B) = P(A) + P(B) - P(A and B) = 0.58 + 0.34 - 0.12 = 0.8

The probability of A or B is 0.8.