Saved Help Sav On the midnight shift, the number of patients with head trauma in an emergency room has the probability distribution shown below. X 1 2 3 4 5 Total P(X) . 04 . 33 . 27 . 21 . 13 . 02 1.00 (a) Calculate the mean and standard deviation. (Round your mean value to 2 decimal places and standard deviation to 3 decimal places.) Mean Standard deviation (b) Describe the shape of this distribution. O Skewed to the right O Skewed to the left O Symmetric