NEED HELP ASAP! 14.) Use the given degree of confidence and sample data to construct a confidence interval for
the population mean u. Assume that the population has a normal distribution.
n = 12, x = 28.3, s = 4.8, 99% confidence

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?