WHAT IS THE LCL, CENTER LINE AND UCL? A2= 0.18

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Note that each sample has a size of 20, e.g. n=20. Sample Mean Range 1 4.01 0.10 2 3.97 0.15 3 4.02 0.20 4 3.99 0.15 5 4.02 0.16
6 4.06 0.21 Question 1 What is the value for A2? Answer: x (0.18)

Note that each sample has a size of 20, e.g. n=20. Sample Mean Range 4.01 0.10 3.97 4.02 3.99 4.02 4.06 1 2 3 Answer: 4 5 6 Question 1 What is the value for A? 0.15 0.20 0.15 0.16 0.21 x (0.18)