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1. Three couples that were invited to dinner will independently show up with probabilities 0.9, 0.8, and 0.75. Let N be the number of couples

1. Three couples that were invited to dinner will independently show up with probabilities 0.9, 0.8, and 0.75. Let N be the number of couples that show up. Construct the distribution series for N and calculate its expected value and variance

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