2-48. Plastic parts produced by an injection-molding opera- tion are checked for

Question

2-48. Plastic parts produced by an injection-molding opera- tion are checked for conformance to specifications. Each tool contains 14 cavities in which parts are produced, and these parts fall into a conveyor when the press opens. An inspector chooses 3 parts from among the 14 at random. Two cavities are affected by a temperature malfunction that results in parts that do not conform to specifications. (a) How many samples contain exactly 1 nonconforming part? (b) How many samples contain at least I nonconforming part?

Explanation / Answer

Since inspector is choosing only one part, the answer for a) and b) would be same because the part can be conforming or nonconforming.

Hence,

P(Inspector finds exactly one nonconforming part)

= P(Inspector finds at least one nonconforming part)

= 2/14

= 1/7

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