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OpenStudy (anonymous):
please help Find the mean and standard deviation of the following probability distribution: x 1 2 3 P(x) 0.2 0.4 0.4
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OpenStudy (tkhunny):
E[x] = 1*0.2 + 2*0.4 + 3*0.4 = Mean = First Moment E[x^2] = 1*0.2 + 4*0.4 + 9*0.4 = Second Moment Var(X) = ??? You tell me. StdDev(X) = ???
OpenStudy (anonymous):
thank you
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