Mathematics, 10.12.2019 19:31, battlemarshmell

You have seven cards, numbered 3 through 9, and you pick one at random. if you pick a card with a prime number, you get 1 point; if you pick a card with a composite number, you lose 1 point. find the expected value of the number of points you get.

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You have seven cards, numbered 3 through 9, and you pick one at random. if you pick a card with a pr...