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.
Pretty standard. And of course, the most important thing on the hitch is the weight rating plate. In this case, it says we can tow up to 5000 pounds. When a manufacturer tells you that the vehicle can tow 5000 pounds, this is where that comes from â the hitch rating (typically). So, this alone would bring our 7500 pound towing capacity down to 5000 pounds. But thereâs more. Next, we need to find a weight sticker that was put on by the RV manufacturer.