your explanation is the only one I understand because of your disclaimer that dealing with percentages, is dealing with average values. If you don't know that then the question is confusing but if u do it's like any other average question. Thanks!

Hi, I also have the same question as everyone above

I hate when I get a question wrong because of a silly mistake with my conditional chain. I made the invalid inference PS ←s→ A and chose C. But, I definitely see how that was wrong now.