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random sample of size n is taken from a very large lot of items in which 100 p% have exactly one defect and 100 p2% have two or more defects, where 0 < pi p2 < 1. an item with exactly one defect costs $1 to repair, whereas an item with two or more defects costs $3 to repair. determine the expected cost of repairing the defective items in the sample.