Ten customers visit a bakery from 8 a. m. to 10 a. m. the customers spend 10, 15, 20, 11, 8, 12, 5, 18, 29, and 32 minutes in the bakery. what is the average flow time (in minutes) of a customer at this bakery?

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?