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) .03 .42 .30 .19 .05 .01 1.00

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



Answer :