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1.Each week a German factory produce shoes out of which the distribution of defective shoes are given as 10, 20, 40 and 70 with probability

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1.Each week a German factory produce shoes out of which the distribution of defective shoes are given as 10, 20, 40 and 70 with probability 30%, 40%, 20% and 10% respectively. [20 points ] (a)Find the expected number of defective shoes in the factory. (b)Find the standard deviation of defective shoes in the factory

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