Given is a typical X and R chart form with information on acid content in milliliters. Complete the calculations for subgroups 22, 23, 24, and 25. Plot the points to complete the run chart. Construct a control chart by calculating and drawing the trial central line and limits. Analyze the plotted points to determine if the process is stable.

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VARIABLES CONTROL CHART PART ID: CHECK METHOD: DEPT/AREA: OPERATION ID: NOMINAL VALUE: 0.70 ml 1 2 3 4 5 6 1 SAMPLE READINGS 3 2 65 85 80 75 70 .75 3 65 75 75 60 65 .75 .65 RR 780 8 85 75 80 65 75 60 80 70 75 60 80 .75 70 65 75 .60 85 228 9 10 11 12 13 14 15 16 .70 .75 .85 .70 .70 .75 .85 .60 4 70 85 70 70 80 .70 75 75 .80 80 50 .65 .70 RRRR 2 .75 .75 85 .60 65 60 .50 65 CHART ID: Problem 1 CHARACTERISTIC: Acid Content TOLERANCE: 0.20 25 17 18 19 20 21 22 23 24 .85 80 70 70 65 65 55 75 80 65 65 28 65 60 70 90 .85 75 85 .80.75 75 70 85 60 65 65 & .75 .65 .70 75 80 80 70 70 65 65 .80 .80 65 .60 .60 SUM, EX AVERAGE, X RANGE, R 289 x= 15 15 15 15 UCL= 2.85 3.20 3.05 2.70 2.90 2.80 2.95 2.80 3.25 2.70 2.95 3.10 2.85 2.95 3.20 3.10 3.00 2.70 2.80 2.50 2.50 71 .80 76 68 73 .70 74 .70 .81 .68 74 78 .71 .74 .80 .78 75 68 .70 63 63 20 .10 10 15 .10 20 40 .20 .05 .20 10 .05 15 10 20 05 30 LCL= AVERAGES RANGES 20 .80 60 .30 .20 2 .10 R= UCL= LCL