Question

Find the missing probability
P(A)=.3 P(B).4 P(A or B) = ? P(A and B) = .2

Answer 1

• 0.5

Explanation:

• P(A) = 0.3
• P(B) = 0.4
• P(A ∪ B) = 0.2
• P(A∩B) = x

Use below formula and find the missing probability:

• P(A∪B) = P(A) + P(B) - P(A∩B)
• 0.2 = 0.3 + 0.4 - x
• x = 0.7 - 0.2
• x = 0.5