2.7 From past experience, it is known that, on the average, 10% of welds performed by a particular welder are defective. If this welder is required to do three welds in a day, (a) What is the probability that none of the welds will be defec- tive? (b) What is the probability that exactly two of the welds will be defective? (c) What is the probability that all the welds for a day are defec- tive? It is assumed that the condition of each weld is independent of the conditions of the other welds.

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