Not normal, most likely a wake lock.
Usually I get about 1% per hour on standby and thats with notifications of certain applications still popping in and wifi on.
There's no one answer when it comes to battery life. Everyone needs to find their own way because everyone has their own set of applications that run in the background based on what they install and how they use the tablet.
Best advice is to monitor battery use in the battery page in settings and see what applications are near the top of the list.
I've noticed that if I leave an open S-Note session running on the tablet and let the screen go to sleep for example then I'm hit with a wakelock that keeps battery drain higher.
This kind of stuff is why many of us want root access so that we can have better monitoring ability and control over processes running on our devices.