Homework Help: probability

Posted by Anonymous on Wednesday, February 15, 2012 at 8:43am.

The probability that a student passes Biology is 0.35 and the probability to pass Chemistry is 0.63. If the probability to pass both Biology and Chemistry is 0.4, what is the probability that he will pass either Biology or Chemistry?

probability - Reiny, Wednesday, February 15, 2012 at 9:27am
Prob(B or C) = Prob(B) + Prob(C) - Prob(B and C)
= .35+.63 - .4
= ...

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