CSWP example sample question - Not sure why the mass is off

My answer is 1415.89 g

100%

I found the error in your model. A couple of points of constructive criticism if you dont mind :).
1. Be careful/thorough where you set your origin, I would have personally set the origin as the centre of the radius for the 135mm dimension as there are several dimensions referenced from this point.
2. you have a lot of blue sketches in your model. I've working in industry (Formula1) and this was the number one rule when I had my CAD training. If your sketch is blue then you haven't fully defined it meaning you don't fully understand how you want it to look.

The solution to your problem can be seen with the screenshot i've attached. You'd referenced the 32mm from some incorrectly positioned construction line. If you add a reference axis as the centre of the through-hole then the mass adds up perfectly to what you're expecting...1415.89 (1416 to 0.d.p).

I've uploaded my model too for reference, hopefully it is helpful to you :).

If you need any help please let me know!

This is the screenshot of your mistake which I have corrected :)

the answer is 1414.14 gr