Twenty of the 100 digital video recorders (DVR$) in an inventory are known to be defective. What is the probability that a randomly selected item is defective? The probability is (Type an integer or a decimal. Do not round)

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A: Given: μ=60x¯=58.6n=43σ=6.55 The test statistic is obtained as below: z=sample statistic-Null…

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