X012 P(x)0.20.60.2 A probability distribution is as shown. If it is repeated and the 2 distributions combined then the following would be the table of.

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Presentation transcript:

x012 P(x) A probability distribution is as shown. If it is repeated and the 2 distributions combined then the following would be the table of potential results Value x Prob’ x0.60.2x x x x x0.2

Prob’ y01234 P(y) yP(y) y 2 P(y) E(y)=  y P(y)] = = 2.00  2 =  y 2 P(y) –   =  2 = 4.8 – 4 = 0.8

y01234 y -  (y-  ) P(y) (y-  ) 2 P(y) E(y)=  y P(y) = = 2.00  2 =  (y –   P(y) =  2 = 0.8 Alternatively using the other formula for Variance