Math Is Fun Forum

soureddy.c

Member

Registered: 2007-11-11

Posts: 3

2 more.......help

hy i have 2more problems .....help me with the solution........plz

1)If X and Y have a bivariate normal distribution and U=X+Y and V=X-Y find an expression for the correlation coefficient of U and V.

2)If X has an exponential distribution show that
              P(X>=t + T\X>=T) = P(X>=t)
this property of an exponential random variable parallels that of a geometric random variable given as [ P(X=x+n\X>n) = P(X=x)
thanks a bunch.......