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Let's say you've invited six guests to a dinner party but aren't sure who will show up. Assume that any subset of these 6 people

Let's say you've invited six guests to a dinner party but aren't sure who will show up. Assume that any subset of these 6 people has the same chance of attending as any other subset.

(a) What is the expected value of the number of people who will go to the party?

(b) What is the variance of the number of people who will go to the party?

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