statistics
posted by Paula .
A minicomputer system contains two components, A and B. The system will function so long
as either A or B functions. The probability that A functions is 0.95, the probability that B
functions is 0.90, and the probability that both function is 0.88. What is the probability that the
system functions?

Wouldn't that be the probability that both A and B function?
However, the probability of both events occurring is found by multiplying the probabilities of the individual events. I get .855.