You estimate that there are 48 marbles in a jar. the actual amount is 36 marbles. find the percent error. round to the nearest tenth of a percent if necessary.

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?