Capital One BA Intern

I'm prepping for my power day in a few days and I was wondering if anyone could give me an example of what exactly a "weighed average" problem might look like. 

Also, I would appreciate any insight or information on the power day as well as the logistics of it.  I'm confused about the product interview. What exactly is the formatting of that interview and what kind of questions are asked? I would appreciate any advice going into my interview.