Assume that X and Y have a bivariate normal distribution with parameters $\displaystyle \mu_{X} = 14, \sigma^2_{X} = 4^{2}, \mu_{Y} = -1, \sigma^2_Y = 3^2, \rho = 0.9$

$\displaystyle (a) P (0 < Y \le 1)$

$\displaystyle (b) P (0 < Y \le 1 | X = 18)$

Thanks for your help!