Directions: Solve the following problems and write your solutions clearly in a sheet of yellow paper. A correct solution without supporting work may receive little or no credit 1. Carmella's monthly gasoline expenses, in dollars, for the past year are shown. 61, 83, 77, 88, 67, 71, 65, 72, 67, 84, 90, 80 (a) Calculate the range, to the nearest dollar. (1 point) (b) Calculate the variance and the standard deviation, to the nearest dollar. (3 points)