A company uses any one of three machines to produce 'identical' hinges. The output of hinges from the three machines is in the ratio 6:3:1. The percentage of defects is 5, 20 and 10 respectively. What is the overall percentage of defects?
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Three machines A, B and C produce respectively 50%, 30% and 20% of the total number of items of a factory. The percentage of defective output of these machines are 3%, 4% and 5% respectively. if an item selected at random, find the probability that the item is non-defective.
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