solution

The weight of a bag of industrial salt needs to be monitored using control charts. Several samples were taken where fifteen 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 407 ounces and the average range was found to be 25.50 ounces. What is the lower control limit of the – chart (i.e., x-bar chart)? [Select the appropriate range in which your answer falls.]

Question 11 options:

less than or equal to 396

greater than 396 but less than or equal to 398

greater than 398 but less than or equal to 400

greater than 400 but less than or equal to 403

greater than 403

 
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