solve it on the paper

Control charts for X(bar) and s are to be established on the Brinell hardness of hardened tool steel in kilograms per square millimeter. Data for subgroup sizes of 8 are shown. Determine the trial central line and control limits for the X(bar) and s charts. Draw the control charts and analyse the process. Assume that the out-of-control points have assignable causes. Calculate the revised limits and central line. (20) Subgroup Number 1 2 3 4 5 6 7 8 9 10 11 12 13 X S 540 26 534 23 545 24 561 27 576 25 523 50 571 29 547 29 584 23 552 24 541 28 545 25 546 26 Subgroup Number X S 14 551 24 522 29 579 26 549 28 508 23 569 22 574 28 563 33 561 23 548 25 556 27 553 23 15 16 17 18 19 20 21 22 23 24 25