/sci/ - Science & Math

How would I go about calculating [math] V(N_p|\tilde{N_p})[/math]? I know by definition that [math] V(Y|X)=\sum (y-E(Y|X)^2\times P(Y|X) [/math]. So should I simply calculate [math] (1-[p+(1-p)(1+\tilde{N_p})])^2\times p + (1 + \tilde{N_p}-[p+(1-p)(1+\tilde{N_p})])^2\times (1-p) [/math]?