In reply to dave_59:
I got the question wrong. I thought each value is having 75% weightage.
I have one thing to clarify. if I get distribution like -
constraint tag{data dist{7:=5 , [11:20]:=3 , [26:30]:/5};}
This one is providing dist of 12.5% for value 7, 7.5% for each value inside the range of 11-20 or 75% for that range, and 12.5% for the range 26-30.
Am I right or do I badly need to go through a probability course again?