PRC-2 · Chapter 11 · Question 34 of 60
Events X and Y are non-mutually exclusive. If P(X) = 0.60, P(Y) = 0.50, and the probability of both occurring together P(X and Y) = 0.30, what is the probability of either X or Y occurring?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) 0.80
Explanation
For non-mutually exclusive events, you must subtract the overlapping probability to avoid double-counting. P(X or Y) = P(X) + P(Y) - P(X and Y). 0.60 + 0.50 - 0.30 = 0.80.
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