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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

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 .32 .27 .19 .10 .09 1.00

(a)Calculate the mean and standard deviation.

Mean - ?

Standard deviation - ?

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