**1. The problem statement, all variables and given/known data**

If X and Y have a bivariate normal distribution with [tex]m_X=m_y=0[/tex] and [tex]\sigma_X=\sigma_Y=1[/tex], find:

a) E(X|Y=1) and Var(X|Y=1)

b) Pr(X+Y>0.5)

**2. Relevant equations**

N/A

**3. The attempt at a solution**

Apologies, but I don't seem to know where to start on this one.