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The probabilities that a batch of 4 computers will contain 0, 1, 2, 3, and 4 defective computers are 0.4305, 0.4039, 0.1421, 0.0222, and 0.0013, respectively. Find the variance of the number of defective computers in a batch of 4. A) 0.78 B) 0.62 D) 1.19 C) 0.54
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