7.89 Canned Tomatoes During long pro- duction runs of canned tomatoes, the average weights (in mL) of

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7.89 Canned Tomatoes During long pro- duction runs of canned tomatoes, the average weights (in mL) of samples of five cans of standard- grade tomatoes in puree form were taken at 30 control points during an 11-day period. These results are shown in the table. 24 When the machine is performing normally, the average weight per can is 621 mL with a standard deviation of 35.5 mL.

a. Compute the upper and lower control limits and the centreline for the chart.

b. Plot the sample data on the x chart and determine whether the performance of the machine is in control.

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