The purity of a chemical product is measured on each batch. Purity determination for 20 successive batches are shown in Table 6E.30.

(a) Is purity normally distributed?
(b) Is the process in statistical process control?
(c) Estimate the process mean and standard deviation.

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TABLE 6E.30 Purity Data for Exercise 6.72 Batch Purity Batch Purity 0.81 2 0.82 3 0.81 40.82 5 0.82 0.83 7 0.81 0.80 9 0,81 10 0.82 1 081 12 13 0.81 14. 15 081 16 17 083 18 19 20 0.83 0.82 0.85 0.87 0.86 0.84