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.
Generally, a typical tow of five miles or less might cost $35-$125; a 40-mile tow could be $125-$275; a 100-mile tow could cost $275-$600; and having a vehicle towed hundreds of miles could cost $1,000 or more. Some companies charge 20%-25% more for towing a truck or other heavy-duty vehicle. For example, Harris Towing Service & Auto Repair Center in Delaware has a flat rate of $60 for local towing; long-distance is a $75 hook-up fee plus $3.50 per mile; and towing a heavy-duty vehicle has a $150-$175 hook-up fee plus $5.50-$7.00 per mile.