A quality engineer who collected process data for 10 subgroups with each subgroup consisting of three samples (n=3) in Table 1 decided to discard data of subgroups 6 and 7. The remaining averages and ranges of three samples in each of 8 subgroups are summarized in Table 2 below. Table 2. Subgroup Data (2-1) Calculate center line Xnnw of X chart excluding subgroups 6 and 7 . (2-2) Calculate average range Rmew,wh which is also the center line of R chart, excluding suberoups 6 and 7. (2-3) Calculate standard deviation n bv using R. (2-4) Calculate upper control limit (UCL) and lower control limit (LCL) of X chart excluding subgroups 6 and 7 by approximation using n calculated above. 2-5) Create X chart with center line, UCL, and LCL, and plot subgroup data in the below figure (do not lot data for subgroup 6 and 7). Clearly label center line, UCL, and LCL