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Probability

In this example we have to calculate the expected no. Of defective lamps then why did they have calculated for non defective lamps

Answers (2)

Please see the full solution in the material. Computation is done in 4 assumptions as what will be the probability when the defectives selected are either 0,1,2 or 3 when 3 lamps are selected. On adding all the 4 outcomes, we get the total probability of selecting defective lamps.