Yesterday, the price of a loaf of bread at five supermarkets was $1.54, $1.69, $1.79, $1.57, and $1.71, but today each supermarket raised its price by $0.05. what is today's mean price of a loaf of bread at the five supermarkets?
a. $1.71 b. $1.76 c. $1.81 d. $1.66

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?