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Question

Parts exiting an assembly line are inspected and categorized as good or bad (defective). In a batch of 100 parts, 8 were found to be defective.
What is the probability that a part drawn at random is defective?


  1. 0.8

  2. 0.2

  3. 0.02

  4. 0.08


Solution

The correct option is D

0.08


Number of parts exiting an assembly line which are bad(defective) = 8

Total number of parts passing the assembly line = 100

Probability of part being defective =Number of defective partsTotal number of parts

Probability of a part being defective =8100=0.08

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