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If the probability of A not appearing over a time interval is p, and the probability of B not appearing over the same time interval is q, what is the probability of both not appearing? Is it  pq or p+q?

greenink 22/06/20.

 Jun 22, 2020
 #1
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If they are independent events, multiply the probabilities.

 

The reason that adding is not appropriate:

-- consider this case:

    -- assume that the probability of A not appearing is 0.90 

    -- assume that the probability of B not appearing is 0.80

-- if you added them together, you would get a probability of 1.70, an impossibilit.

 Jun 22, 2020

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