The probability of passing Psychology Class is 409 the proba

The probability of passing Psychology Class is 40.9%, the probability of passing Chemistry Class is 48.7%, and the probability of passing both of these classes is 23.5%.

(1) What is the probability of passing Psychology or Chemistry?

Solution

Note that

P(P or C) = P(P) + P(C) + P(P and C)

= 40.9% + 48.7% -23.5%

= 66.1% [answer]