# Probability

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• #54119

Mike Russ
Participant

I have an event probability of 0.004. This is the probability that a standard line product manufactured on any given day have a chance of 0.4 % of being defective. This was calculated by using the manufacture date of 9 defective units being found. We make lot sizes of 10 or 100 units in each lot and store in inventory. The question is, what is the probability of getting a defective unit if I take one unit out of inventory (could be from lot size 10 or 100)? How we calculate this probability.

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#193726

Gary Cone
Participant

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#193727

Guest

Hint: Try Binomial

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#193729

Prabhu V
Participant

Hi,

According to me, confidence interval related stuff can help better in the situation.

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#193765

Niraj Goyal
Guest

The probability if you pick just one piece of a defective is .004 whatever the lot size. There is indifference the size of Lot you pick it from.
If the question was is the probability of finding a reject in 10 samples of a lot or 10 samples from a lot of 100 then Binomial would be used with p=.004 and 10 tries

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