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    NationalHardStatistics7–9

    Two events AA and BB are mutually exclusive. P(A)=0.3P(A) = 0.3, P(B)=0.5P(B) = 0.5. What is P(A or B)P(A \text{ or } B)?

    Dois eventos AA e BB são mutuamente exclusivos. P(A)=0,3P(A) = 0{,}3, P(B)=0,5P(B) = 0{,}5. Qual é P(A ou B)P(A \text{ ou } B)?

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    Solution

    For mutually exclusive events: P(A or B)=P(A)+P(B)=0.3+0.5=0.8=45P(A \text{ or } B) = P(A) + P(B) = 0.3 + 0.5 = 0.8 = \frac{4}{5}