Consider a game in which a red die and a blue die are rolled. Let xR denote the value showing on the uppermost face of the red die, and define xB similarly for the blue die. (a) The probability distribution of xR is as follows. xR p(xR) 1 1/6 2 1/6 3 1/6 4 1/6 5 1/6 6 1/6 Find the mean, variance, and standard deviation of xR. (Round your answers to three decimal places.) Mean