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A company is engaged in the packaging of a superior quality tea in jars of 500gm each. The company is of the view that as

A company is engaged in the packaging of a superior quality tea in jars of 500gm each. The company is of the view that as long as the jars contains 500gm of tea, the process is under control. The standard deviation of the process is 50gm. A sample of 225 jars is taken at random and the sample average is found to be 510 gm. Has the process gone out of control?

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