Post-UTME Mathematics 2012 Objective — Question 10
Question 10 of 11 from the Post-UTME Screening (Post-UTME) Mathematics 2012 Objective paper, with the correct answer and a full explanation.
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X and Y are two events. The probability of X or Y is 0.7 and the probability of X is 0.4. If X and Y are mutually exclusive, find the probability of Y
- A. 0.3Correct
- B. 0.28
- C. 0.5
- D. 0.8
Explanation
For mutually exclusive events, P(X or Y)=P(X)+P(Y). 0.7=0.4+P(Y), so P(Y)=0.3.
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