Hi,

 Find the mean and standard deviation of the following probability distribution

x      1    2   3

P(x)  .3   .4  .3



E(x) = 1*.3 +2*.4 +3*.3 = 2

sd = sqrt[(1-2)^2*.3 + (2-2)^2*.4 + (3-2)^2 *.3] = .77 

 

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