Homework Answers
Since n=5 so for xbar chart we need to find ucl = xbar+A2*Rbar
Lcl = xbar-A2*Rbar
For R chart
Ucl =D4Rbar
Lcl =D3Rbar
Now for n= 5 A2= 0.577 ,D3=0 ,D4= 2.114
Using appendix table
Hence we have xbar ucl= 75.002+0.577*0.005 = 75.00485
Lcl =75.002-0.577*0.005 =74.9991
Rchart ucl = 2.114*0.005 =0.01057
Lcl =0*0.005=0
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