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ericnutsch
Lv 5
ericnutsch asked in Science & MathematicsMathematics · 10 years ago

Probability of independent OR events?

Ok so i have two independent probabilities:

P(A)=0.01

P(B)=0.01

What is the probability of P(A) or P(B)?

(I know its not P(A) + P(B), and its not P(A) * P(B). )

My gut tells me it should be around 1.5% but i cant seem to remember(or find) the equation...

Thanks!

1 Answer

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  • u.n. o
    Lv 5
    10 years ago
    Favorite Answer

    P(A) + P(B) = 1 - P(A*)P(B*) = 1 - 0.99^2 = 0.0199

    where I use P(A*) as meaning "probability of NOT A", etc.

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