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This question doesn't even make sense to me. Please help. I've attached the data below. Compute limits for the sample mean x around =12 such

This question doesn't even make sense to me. Please help. I've attached the data below.

Compute limits for the sample mean x around =12 such that, as long as a new sample mean is within those limits, the process will be considered to be operating satisfactorily. If x exceeds the upper limit or if x is below the lower limit, corrective action will be taken. For quality control purposes, these limits are referred to as lower and upper control limits, respectively: Lower Control Limit = (Round answers to 4 decimal places) Upper Control Limit = (Round answers to 4 decimal places)

Sample 1 Sample 2 Sample 3 Sample 4
11.55 11.62 11.91 12.02
11.62 11.69 11.36 12.02
11.52 11.59 11.75 12.05
11.75 11.82 11.95 12.18
11.9 11.97 12.14 12.11
11.64 11.71 11.72 12.07
11.8 11.87 11.61 12.05
12.03 12.1 11.85 11.64
11.94 12.01 12.16 12.39
11.92 11.99 11.91 11.65
12.13 12.2 12.12 12.11
12.09 12.16 11.61 11.9
11.93 12 12.21 12.22
12.21 12.28 11.56 11.88
12.32 12.39 11.95 12.03
11.93 12 12.01 12.35
11.85 11.92 12.06 12.09
11.76 11.83 11.76 11.77
12.16 12.23 11.82 12.2
11.77 11.84 12.12 11.79
12 12.07 11.6 12.3
12.04 12.11 11.95 12.27
11.98 12.05 11.96 12.29
12.3 12.37 12.22 12.47
12.18 12.25 11.75 12.03
11.97 12.04 11.96 12.17
12.17 12.24 11.95 11.94
11.85 11.92 11.89 11.97
12.3 12.37 11.88 12.23
12.15 12.22 11.93 12.25

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