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

a) Distinguish between:
i. Chance causes and assignable causes
ii. Variables and attributes
8M
b) The following are the inspection results of 10 lots, each lot being 300 items. Number
defectives in each lot are 25, 30, 35, 40, 45, 35, 40, 30, 20 and 50. Calculate the average
fraction defective and three sigma limits for P-chart and state whether the process is in
control.

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