The average of allsubgroups becomes the centerline for the lower plotting area. Average of Ranges Example Step 7 - Calculate the upper control limit (UCL) and lower control limit (LCL)for the averages of the subgroups. At this point, your chart will look like aRun Chart. Now, however, the uniqueness of the Control Chart becomes evidentas you calculate the control limits.
Ford Motor Company recommends that the Crown Vic limit its towing to a trailer with a gross vehicle weight of 1500 lbs or less with a tongue weight not to exceed 150 lbs. See HERE.
  Answer   The towing capacity for a 2003 Chevy Silverado 1500 is 8400-pounds with Quadrasteer and Quadrasteer increases the towing capacity of Silverado 1500 with t â¦ he Vortec 5300 to 8600 lbs or 10,200 pounds with a weight-distributing hitch and sway control.