Blood types A, B, O, and AB have percentages 40%, 20%, 30% and 10%. If two individuals are chosen at random, assuming independence, how do you find probability that neither is of blood type A?

The probability is ##0.36## or ##36%##

The probability that one chosen person is off blood type ##A## is ##40%=0.4## so the probability that he is not of blood type ##A## is ##0.6##. To calculate the probability that none of ##2## people is of blood type ##A## you have to multiply the probabilities:

##0.6xx0.6=0.36## or ##36%##.