# some clarification in normal distribution

• March 3rd 2011, 10:51 AM
asd1231
some clarification in normal distribution
Hi,

I just have a doubt. What is "u" in the given link and is ther eany way to calculate u which is based on X(meu x, sigma x) and Y(meu y, sigma y)

Normal Difference Distribution -- from Wolfram MathWorld

thanks
• March 3rd 2011, 12:32 PM
pickslides
For U= X-Y, then U is $\displaystyle N(\mu_X-\mu_Y,\sigma_X^2+\sigma_Y^2)$