Not too sure about this. There are few Shiite Muslims in
Singapore, but their exact numbers are uncertain.
In the whole world, roughly 15% of Muslims are Shiite. Now, they
are mainly concentrated in the Persian Gulf around Iran and Iraq.
So I'd say that at the very most 10% of all Muslims in Singapore
are Shiite, while the others are all Sunni.
Just don't take my word for it, for even the proportion of Shiite
Muslims in the whole world is an approximation at best.
By the way, any queries and discussions on Islam may be referred to
The Islam Forum:
http://islam.sgforums.com