> restart:
> with(Statistics):
> pdf:=PDF(RandomVariable(Normal(mu,sigma)),t);
> cdf:=CDF(RandomVariable(Normal(mu,sigma)),t);

                                                 2
                               1/2       (t - mu)
                              2    exp(- ---------)
                                                2
                                         2 sigma
                   pdf := 1/2 ---------------------
                                     1/2
                                   Pi    sigma


                                       1/2
                                      2    (t - mu)
                 cdf := 1/2 + 1/2 erf(-------------)
                                         2 sigma

> 
