Question

Given that P(A) =0.55 P(B) =0.27 and P(A and B) = 0.13 if events A and B are mutually exclusive find P(A or B)

Answer 1

For two mutually exclusive events

$$P(A\ or\ B)=P(A)+P(B) \\P(A\ or\ B)=0.55+0.27=0.82$$