Over the last 6 weeks, weekly demand for root beer at Ruthy's Root Beer has been 1350, 850, 750, 1400, 670, 1600. Ruthy's Root Beer has placed weekly orders for bottles of 1450, 810, 650, 1500, 1240, 1310. a) What is the variance in the demand for Ruthy's Root Beer? b) What is the variance in the orders of Ruthy's Root Beer? c) What is the bullwhip measure of Ruthy's Root Beer? d) Is Ruthy's Root Beer providing an amplifying or smoothing effect? in excel