gsoc 2018: adding more functionality to stats module

[parag goyal]

hello all,

I am a 3rd year undergraduate student currently pursuing electronics and communication at nit jaipur.I will be the gsoc applicant this year.I have gone through the sympy stats module and found it very interesting .I am good in python.I want to add functions for conditional probability,and functions for multivariate normal distributions to it.Also ,I would like to provide functions for  plotting the pdfs of various  distributions,which are not there in matplotlib or any other plotting library. 

Example code that i want to implement 

[In] from sympy.stats import P,E,variance,Die,

[In]X,Y=Die('X',6),Die('Y',6)

[In]P(X>3|Y>3)

[Out]1/4

and I would like to define nnormal function for multivariate which could take parameters for how many variables and  define different means like E[X^4],E[X1X2] etc.

Please help with  references to be used for this work and guide me for their implementation or for other function implementation.

Thank You !!