Question 19 of 20 > Stacked D - Here is a probability distribution for a random variable X: Value of X 3 7 Probability 0.4 0.6 Identify the rules used to nd the mean and standard deviation of a transformed variable. I] The standard deviation equals the square root of the variance. I] Linear function of a random variable. I] Mean of a discrete random variable. I:I Addition rule for disjoint events