I need help with this question part C

Mathematics
Tutor: None Selected Time limit: 1 Day

Jul 20th, 2015

Thank you for the opportunity to help you with your question!

X-bar

x-bar formula
n is the number of observations 
x-double bar formula
k is the number of subgroups 
Upper control limit:

x-bar & range upper control limit formula

Lower control limit:

x-bar & range lower control limit formula

You can use this formula 
UCL = CL + 3*S
LCL = CL – 3*S

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jul 20th, 2015

okay question what is A2

Jul 20th, 2015

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