alleryFor two events, P(A) = 0.35, P(B) = 0.45 and P(A and B) = 0.20. Then P(A or B) equals:
A0.80 in total
B0.60 in total
C0.25 in total
D1.00 in total
Answer & Solution
Correct answer: B. 0.60 in total
1. The addition rule: P(A or B) = P(A) + P(B) - P(A and B).
2. Substitute: 0.35 + 0.45 - 0.20.
3. P(A or B) = 0.60.
_Source: syllabus Mathematics, Ch 14 'Probability' (kemh114)_
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