I need some help with proton NMR integration...

[BigToque]

We just started covering proton NMR in organic chem class and I'm a little confused about how to calculate the (relative?) number of protons when given some data.

Here's an example of some data:

The answer is that the molecular formula is [C9 H10 O], but I can't seem to figure out how to calculate that there are 10 H's from the data given.

I added the distances in the image as what I measured with my ruler.

 

[logo908]

integral tells you what is here, peaks tell you what is near

 

[RapidSnail]

The only solution that I can think of is 1-phenyl-2-propanone; however, I haven't done spec in a while.