If P(A) = 0.5, P(B) = 0.4, and P(A ∩ B) = 0.2, what is P(A ∪ B)?
Correct answer: B. 0.7
- A. 0.3
- B. 0.7
- C. 0.9
- D. 1.1
Explanation
The addition rule gives P(A ∪ B) = P(A) + P(B) - P(A ∩ B). Thus, the result is 0.5 + 0.4 - 0.2 = 0.7.
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