On the midnight shift, the number of patients with head trauma in the ER has the probability distribution shown below

x 0 1 2 3 4 5 total

P(x) .01 .30 .25 .19 .13 .12 1.00

(a) Calculate the mean and standard deviation (round your mean value to 2 decimals

Mean--------------

Standard deviation---------------

(b) Describe the shape of the distribution

1) Skewed to the right

2) skewed to the left

3) Symmetric