The one-period newsvendor model starts with a finite demand distribution.
Low demand
Demand 1 has probability 1/4.
P(D=1)=1/4
Middle demand
Demand 2 has probability 1/2.
P(D=2)=1/2
High demand
Demand 3 has probability 1/4.
P(D=3)=1/4
Finite demand
This is a pinned one-period distribution, not a forecast made by the lesson.
finite pinned distribution