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  3. please as soon as possible...

Question: please as soon as possible...

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Please as soon as possible!

2. A screw factory has two machines, the M1, which is old, and does 80 % of all the screws, and the M2, newer but small, that does 20 % of the screws. The M1 does 5 % of defective screws, while the M2 just does 1 % of defective screws. If we choose a screw at random: what is the probability that it turns out to be defective?
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