What happened to the denominator?

[BiGyElLoWhAt]

https://www.google.com/url?sa=t&sou...kQFjAA&usg=AFQjCNHNb5B-8fMy4Z5qUxPCOA9yChX72w
Here's the paper, it's just an intro to QM, but when the calculate the expectation value at the bottom of page 1-20 it all looks right, and they list it again at the top of the next page, but the denominator just disappeared. Am I missing something, or is this just a typo?

 

[Fredrik]

The denominator is 1 if all the kets are normalized, and they're saying at the bottom of 1-20 that they are.

 

[BiGyElLoWhAt]

Ahhh. Thanks, I missed that.