1. Given the following data sets. Compute their mean, variance and median: (5 point each) a) { 5, 7, 2, 3, 1, 9, 5} b) { 4, 2, 2, 1 , 2 , 1 , 4 , 1 , 4 , 5 , 8 } c) { 3, 5 , -8 , 0 , 2 , 3, -1 }