The weight of a bag of sugar needs to be monitored using control charts. Several samples were taken where twelve bags were randomly selected. The average weight of the bag and range were calculated for each sample. Over all the samples, the average weight of the bag was found to be 396 ounces and the average range was found to be 30 ounces. What is the upper control limit of the e8 - chart (i.e., x-bar chart)? [Select the appropriate range in which your answer falls.]