Are You a Thirder?

There are two scenarios in which we arrive at Monday. If you're a halfer, then you would almost have to say, well, I'm being woken up, but there's a great deal. And whereas if you're a thirder, you're going to say that there's a two thirds chance it's Monday and a one third chance that it's Tuesday. But given that it's heads, there's a 100% chance that it is Monday.