Nothing
x <- 0:2
sum((x - 1)^2 * dbinom(x, 2, 0.5)) # same as above
n <- 5; p <- 0.2; x <- 0:n
sum((x - n*p)^2 * dbinom(x, n, p)) # X ~ Binom(5, 0.2)
n <- 5; p <- 0.8; x <- 0:n
sum((x - n*p)^2 * dbinom(x, n, p)) # X ~ Binom(5, 0.8)
n <- 10; p <- 0.8; x <- 0:n
sum((x - n*p)^2 * dbinom(x, n, p)) # X ~ Binom(10, 0.8)
n <- 20; p <- 0.8; x <- 0:n
sum((x - n*p)^2 * dbinom(x, n, p)) # X ~ Binom(20, 0.8)
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