What is the mean median and mode of the following numbers
27,29,29,30,31,31,31,33,33,34,34,36 ,36,37,40,42,42,45,49,50,50,50,50,5 2,55,56,58,60,72

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?