# Math Help - probability distribution

1. ## probability distribution

For the following probability distribution ,u=

xi 250 300 400
pi 0,30 0,50 0.20 my guess is 305, nee help seting this one up please. thanks o much for your help with this one.

2. Originally Posted by kwtolley
For the following probability distribution ,u=

xi 250 300 400
pi 0,30 0,50 0.20 my guess is 305, nee help seting this one up please. thanks o much for your help with this one.
I guess you are trying to find the mean of this distribution. The mean in this
case is:

mu= sum(x_i p_i, i=1,2,3)=250x0.30 + 300x0.50 + 400x0.20=305.

RonL

3. ## thanks thats it

yes that what I needed to see, I got it right but I didn't set the problem up right, thanks again.