9. 10. Suppose a picker needs to walk from the beginning of the aisle to a location at a distance L, pick an item, and return to the beginning of the aisle. The picker walks at a speed of 2.5 minutes per second and takes 10 seconds to pick the item. (a) Give an equation for the round trip travel time R as a function of L and the other data. (b) If the mean of L is 5 meters and the standard deviation of L is 3 meters, what is the mean and variance of R? Suppose that in the previous problem, 20% of the items are responsible for 90% of the requests. The company is consider reordering the items in the aisle so that the high turnover items are in the rst Suppose we have a picker at the front of an aisle of length 20 meters. The picker walks at a speed of 2.5 meters per second. The picker needs to go to a location at a distance L from the beginning of the aisle. Assume that the p.d.f. is of the form c, for0