6. a) Distinguish between: i. Chance causes and assignable causes ii. Variables and attributes 8M b)

6. a) Distinguish between:i. Chance causes and assignable causesii. Variables and attributes8Mb) The following are the inspection results of 10 lots, each lot being 300 items. Numberdefectives in each lot are 25, 30, 35, 40, 45, 35, 40, 30, 20 and 50. Calculate the averagefraction defective and three sigma limits for P-chart and state whether the process is incontrol.

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