On a recent statistics exam students received scores as follows.

34 45 34 75 78 66 34 95 23 56 87 56 34 45
56 87 09 87 57 87 56 87 54 77 92 95 34 36

Identify the corresponding bar graph.

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?