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{"ops":[{"insert":"A manufacturer knows that on average 20% of the electric toasters produced require repairs within 1 year after they are sold. When 20 toasters are randomly selected, find appropriate numbers x and y such that"},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"a) the probability that at least x of them will require repairs is less than 0.5;"},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":""},{"insert":"\n"},{"insert":"(b) the probability that at least y of them will not require repairs is greater than 0.8."},{"insert":"\n"}]}
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