Compute the mean and standard deviation of the random variable with the given discrete probability distribution. x P(x) -5 0.11 0.26 4 0.23 6 0.28 8 0.12 Send data to Excel Part 1 of 2 (a) Find the mean. Round the answer to three decimal places, if necessary. The mean is Part 2 of 2 X G (b) Find the standard deviation. Round the answer to three decimal places, if necessary. The standard deviation is 5