Please solve it ASAP. From the Quality and Productivity management Class. This question will be finding the UCL and LCL for the X double bar and the Range of a control chart.
It will be a step by step process beginning with finding the x double bar, the means for the Range,
the Mean control limits and the Range control limits.

A quality inspector took 5 samples, each with 4 observations (n = 4), of the length of time for glue to
dry. All values are in minutes. Use the information below and to find the X double bar (mean of the means), Range, UCL and LCL for the Means and the Range control charts. Are the control charts in or out of control.
1. X double = 2. Range = 3. UCL and LCL for the means 4. UCL and LCL for the Range 5. Is the X double control chart in control? 6. Is the Range control chart in control?

Sample 1 2 3 4 5 1 12.11 12.15 12.09 12.12 12.09 Observation 2 12.10 12.12 12.09 12.10 12.14 3 12.11 12.10 12.11 12.08 12.13 4 12.08 12.11 12.15 12.10 12.12 Control Chart Factors n A2 D3 D4 d2 A3 B3 B4 2 1.88 0 3.267 1.128 2.659 0 3.267 3 1.023 0 2.574 1.693 1.954 0 2.568 4 0.729 0 2.282 2.059 1.628 0 2.266 5 0.577 0 2.114 2.326 1.427 O 2.089 6 0.483 0 2.004 2.534 1.287 0.03 1.97 7 0.419 0.076 1.924 2.704 1.182 0.118 1.882 8 0.373 0.136 1.864 2.847 1.099 0.185 1.815 9 0.337 0.184 1.816 2.97 1.032 0.239 1.761 10 0.308 0.223 1.777 3.078 0.975 0.284 1.716