The following data for units shipped (X) and Y (shipping cost) has been observed over the last 6 weeks: Week X Y 1 1 2. 4 18 2 17 3 8 3 25 4 5 6 20 5 7 24 6 2. 16 For planning purposes, management would like to know the amount of variable cost of shipping a unit (b) and total fixed shipping cost per week (a). Required Using the High low method, estimate the variable cost of shipping a unit (b) and total fixed shipping cost per week (a) AND express the cost data in the form of Y=a +bx