Calculating the Mean and Standard Deviation of a Discrete Warm-Up Random Variable Suppose you and a friend are playing a game that involves flipping a fair coin 3 times. Let X = the number of times that the coin shows heads. The probability distribution of X is shown in the table. Number of Heads 0 2 3 Probability 0.125 0.375 0.375 0.125 The expected number of heads is The standard deviation of the number of heads is Round to three decimal places