To clarify, what percentage you would like to calculate?
1) The percentage of each gender across an individual age segment? For example, in the 20-24 age range there are 60% female and 40% male.
2) The percentage of of an age segment and single gender in relation to the rest of the data? For example, women in the 20-24 age range correspond to 10% of all the entries.
I tried to address these questions in the following workbook. There are two worksheets, one for each case.
Whilst this problem may seem simple, you have to use Table Calculations and/or LODs to get the desired results, which is something you start learning in Tableau Intermediate. If you have any questions, do not hesitate on asking.
Keep the hard work!
Example for Dave.twbx 899.5 KB