مدرس المادة
Probability Mass Function( P.M. f ): ) ( دالة الكتلة الاحتمالة
Let X be a Discrete Random Variables (d .v . r )
A function f is a P. M .f if f (x)= p (X=x) , and satisfy the following condition :
A ) f(x)
0 , 
x 
X B) 
Note : 1- condition (A) shows the graph of f (x) above of the X- axis .
2- also .if A 
S then P (x 
) = 
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