Construct a mean chart for four samples

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An operator takes samples every half hour from a machine. His four most recent samples are shown in the table below:

Sample

9:00 15 14 15 12 16

9:30 18 16 20 16 15

10:00 16 17 15 16 18

10:30 19 14 11 15 16

Construct a mean chart for these four samples. What is the LCL of the mean chart? Do not round.

Reference no: EM132817530

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