and 3s which you have
already calculated.The last stage of this exercise is to calculate the upper and lower
control limits for the X graph. These calculations are shown in the
third section of your calculation sheet (top right). The calculations
are symmetrical, and they both use the values of and 3s which you have
already calculated.
Enter the value for the upper control limit (UCL X) in the box outlined in red below and then click the button to check your answer. Your answer should be rounded to 1 decimal place.