Suppose X is a random variable with mean µx and variance σ 2 x . Let W ≡ (X − µx)/σx. Then, the mean and variance of W are given by A. µw = 0 and σ 2 w = 0. B. µw = 1 and σ 2 w = 2. C. µw = 0 and σ 2 w = 1. D. µw = 1 and σ 2 w = [infinity]. E. cannot be calculated.