Control charts for X and s are to be estalblished on the Brinell hardness of hardened tool steel in kilograms per square millimeter. Data for subgroups sizes of n=8 are shown below. Subgroup Subgroup Si Si Number Number 1 540 26 14 551 24 534 23 15 522 29 545 24 16 579 26 4 561 27 17 549 28 576 25 18 508 23 523 6 50 19 569 22 7 571 29 20 574 28 547 29 21 563 33 9 584 23 22 561 23 10 552 24 23 548 25 11 541 28 24 556 27 12 545 25 25 553 23 13 546 26 a) Determine the trial center line and control limits for X and s control charts and Setup control charts on this process b) Assume that the out-of-control points have assignable causes. Calculate the revised control limits as necessary c) Estimate the mean and standard deviation of the process.