Ground Coffee Empties into a Chute Containing a Roll of Plastic,which

Short Answer

Ground coffee empties into a chute containing a roll of plastic,which forms a sealed bag of coffee.From every ten bags filled,four are randomly sampled and weighed to see if the mean is correct (the process in control).The average mean for twenty samples of four equals 6.01 ounces.The average range of the twenty samples is 0.08 ounces.What will be the 3-sigma lower control limit for the mean chart?