another ball at random from the bag. Construct a probability tree and calculate the probability that Paul picks a black ball in his second draw. 0.35 0.375 0.41 O 0.456 QUESTION 4 A bag contains 3 black balls and 5 white balls. Paul picks a ball at random from the bag and replaces it back in the bag. He mixes the balls in the bag and then picks another ball at random from the bag. Construct a probability tree and calculate the probability that Paul picks two black balls. 0.14 0.23 0.34