Calculating the standard deviation given a probability distribution. Attachment in Word.

X P(X=x)

(5 @ .12)
(6 @ .24)
(8 @ .44)
(10 @ .20)

What is the standard deviation of X?

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...(i))]

In our example

E(x) = 5(.12) + 6(.24) + 8(.44) + 10(.2) = 7.56.

E(x^2) = sum[x(i)^2*f(x(i))].

In our example ...