1. right click on page , select "new sheet object"->Chart from menu.
2. on general tab select "pie chart"
3. on dimesnions tab add "gender"
4. on expressions tab, add expressions as =count(fieldPeopleName) - put in th ecount() whatevere the field containing your people is called.
5.make sure the "Relative" optin is ticked off.
that should do it.