# Math Help - is the mean and variance correct?

1. ## is the mean and variance correct?

 X 5 8 9 4 10 6 p(X) 1/6 1/6 1/6 1/6 1/6 1/6

Mean : 7

Variance : 4.67

is the mean and variance correct? if wrong plz explain with formula

2. ## Re: is the mean and variance correct?

Is this statics question naaaaaaaaaaaaaaa..............???????????
plz explain team if u have any idea........

thanks

3. ## Re: is the mean and variance correct?

Yes that is correct!

Remember the mean for a PMF is the sum from 0 to n of x*p(x) = E[x]

And the variance is E[x^2] - (E[x])^2

Which is p(x)*x^2 - ( p(x)*x)^2