5% of products made in factory require rework. Last week 20 units were tested and 3 required rework. What is the probability of this happening?

out of 20 samples 3 required rework

hence probabiltiy of rework needed = 3/20 =0.15 or 15%

since probabiltiy of rework required is more than 5% , Hence we can say that Production quality is deteriorating

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