I'm not sure that I got it correct, but I was able to get a smoother curve
by following this example, which looked similar to yours:
The difference that I saw between your calculations and the example were that the Curve
calculation was broken down into more parts (like Total Number of Records being a separate calc).
The impact of this was that in yours, the table calculation had a computing using of "Table Across"
for all the nested parts, but in the example, the Total Number of Records was calculated by Bin.
There were a few other smaller differences (Aggregate on, using the bin parameter in the Bin dimension).
Please see the workbook attached in the Forum thread.
268265bell.twbx 35.7 KB