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    binomial standard deviation with weights

    I'm trying to figure out the standard deviation for a football pool. Assuming the probability of success is .5 for all games which are either won or lost on the point spread. There are weights assigned to each game: 16, 16, 12, 12, 12, 10, 10, 10, 7, 7, 7, 7, 4, 3, 2, 1. The expected value is...