Four beans are randomly withdrawn in succession with replacement, and the number of red beans, $X$, is observed. Determine $\mu$, $\sigma_2$, and $\sigma$ for the random variable $X$.
I'm not really sure how to do this problem or where to start.
If μ = np, and n=4 and p is the probability, would it be the probability of one red marble (7/10) or all four red marbles (7/10)^4? Am i on the right track?