In a city of 100,000 voters, 40% are Democrat, 30% Republican, 20% Green, and 10% Undecided. A
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In a city of 100,000 voters, 40% are Democrat, 30% Republican, 20% Green, and 10% Undecided. A sample of 1000 people is selected.
(a) What is the expectation and variance for the number of Greens in the sample?
(b) What is the expectation and variance for the number of Greens and Undecideds in the sample?
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