I am unable to use the workbook you attached..I am using Tableau 10.0.7 .....
Sorry, I'm on 10.1.5 and I won't be able to downgrade.
You can search the forums for the steps on how to downgrade a workbook to a previous version, or here's some brief steps:
Your datasource will need a 'Row Index' like column:
Drag another instance of Name onto the rows shelf, right click select Measure > Count Distinct. Right click the newly created green pill and select 'Discrete'. Right click again, select Add Table Calculation and set it up as follows: