Five ball bearings are taken from the production line every 15 min and their diameters are measured. The diameters of the sample ball bearings for 16 successive subgroups are given in the following table.

Plot an x̄ chart.

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Subgroup Diameters (mm) of Five Ball Bearings 12345n or ag 6 4.98 5.03 9 5.05 5.01 5.02 7 4.93 4.92 8 4.85 5.02 10 4.98 11 12 13 14 15 16 4.92 5.02 5.01 4.91 4.94 5.06 5.03 5.00 5.02 4.92 4.91 4.99 4.97 5.02 4.95 4.95 5.01 5.07 5.03 5.02 4.96 4.91 4.95 4.88 4.92 5.06 5.04 4.93 5.01 4.93 5.05 4.98 4.90 4.97 5.03 5.05 4.92 4.90 4.96 5.09 5.04 5.00 5.05 4.88 5.00 5.02 5.02 5.09 5.03 4.93 5.07 4.96 5.03 4.94 5.15 4.99 4.90 5.06 5.00 5.02 5.03 4.98 5.02 4.97 5.02 4.97 4.97 4.94 4.99 5.03