How do you add probabilities?

pramrok62

pramrok62

Answered question

2022-09-28

How do you add probabilities?

Answer & Explanation

oldgaffer1b

oldgaffer1b

Beginner2022-09-29Added 9 answers

We can add two probabilities as long as the events are disjoint.

Explanation:
Suppose A and B are two events.
P ( A or B occurs ) = P ( A B ) = P ( A ) + P ( B ) + P ( A B )
Here P ( A B ) is the probability that the two events occur simultaneously. If these events are disjoint, P ( A B ) = 0 and in that case we can add the probabilities.
For example: Suppose events A and B are disjoint, P ( A ) = 0.1 , P ( B ) = 0.2 , then P ( A B ) = 0.1 + 0.2 = 0.3

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