Question 1084574
There are 17 values so the mean would be the middle value. 
{{{mu=10}}}
You could also find the sum, {{{mu=sum(x*P(x))=sum(x)*(1/17)=(17/2)(2+18)(1/17)=20/2=10}}}
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*[illustration CD7.JPG].
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{{{Var(X)=24}}}