On the midnight shift, the number of patients with head trauma in an emergency room has the probability distribution shown below.

x	0	1	2	3	4	5	Total
P(x)	.09	.32	.27	.17	.11	.04	1.00

(a) Calculate the mean and standard deviation. (Round your mean value to 2 decimal places and standard deviation to 3 decimal places.)

(b) Describe the shape of this distribution.

multiple choice

• Skewed to the right
• Skewed to the left
• Symmetric