Q and R are mutually exclusive events. If P(Q) = 0.1 and P(R) = 0.45, find P(Q or R).
If events Q and R are mutually exclusive, it means that they cannot occur at the same time. Therefore, the probability of their union can be calculated by summing their individual probabilities.
P(Q or R) = P(Q) + P(R) = 0.1 + 0.45 = 0.55
So, the probability of either event Q or event R occurring is 0.55.