Sol:
E(X)=sum(X*P(X=x))
=-10*0.05+0*0.20+10*0.05+20*0.05+30*0.30+40*0.35
=24
E(x)=24
variance=sum(X^2P(X=x)-E(X)^2
=(-10)^2*0.05+(0)^2*0.20+(10)^2*0.05+(20)^2*0.05+(30)^2*0.30+(40)^2*0.35-(24)^2
var(X)=284
ANSWERS:
E(x)=24
Var(X)=284
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