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It is known that 10% of the calculators shipped from a particular factory are defective. What is the probability that at least one in a

It is known that 10% of the calculators shipped from a particular factory are defective. What is the probability that at least one in a random sample of four calculators is defective? Consider the following probability distribution Xi. P(x=xi) -2. 0.2 -1. 0.1 0. 0.3 1. 0.4 The expected value is

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