(6 points) For each of the given the data sets below, calculate the mean and standard deviation. (a) 4:3, 41, 60, 60, 41, 52 mean = standard deviation = (b) 4.1, 3.3, 4.5, 3.9, 3.1, 3.1 mean = standard deviation = (c) 7, 13. 3. 17, 15 mean = standard deviation =