T T T T T T T T T F F F F F F F F F NMI NMI NMI NMI NMI NMI NMI NMI NMI If P(A or B) = P(A)+P(B) then events A and B are independent If P(A and B) = P(A)P(B) then events A and B are independent. If events A and B are independent, then P(AI B) = P(A) or B) = P(A) + P(B) - and B) It is hard to explain what a random variable is, but for sure a random variable is not a function. If P(A)=O.7 and P(B)=O.5 then A and B are mutually exclusive. If P(A)=O.4 and P(B)=O.3 then A and B are mutually exclusive. The probability of a straight in poker is at least 1.65. I just flipped a fair coin 10 times in a row and got a tail each time. On my next flip I should bet on heads because a head is due.