#NEWLINE# def conditional_mean( mu_1 , mu_2 , a , sigma_12 , sigma_22 ) : #NEWLINE# #INDENT# 'These arg names are from the Wikipedia article' #NEWLINE# mean = ( mu_1 + ( ( sigma_12 * ( sigma_22 ** ( - 1 ) ) ) * ( a - mu_2 ) ) ) #NEWLINE# return mean