Assume that 20 parts are checked each hour and that X denotesthe number of parts

Question

Assume that 20 parts are checked each hour and that X denotesthe number of parts in the sample of 20 that require rework. Partsare assumed to be independent with respect to rework. c) If the rework percentage increases to 4%, what is theexpected number of hours until X exeeds 1? Assume that 20 parts are checked each hour and that X denotesthe number of parts in the sample of 20 that require rework. Partsare assumed to be independent with respect to rework. c) If the rework percentage increases to 4%, what is theexpected number of hours until X exeeds 1?

Explanation / Answer

Let X has a negative binomial distribution with p = 0.04 and r =1

So, the expected number of hours is given by, E(X)=1/0.04=25.

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