50% of what?

Hi Brooke,
Just watched the overeating call replay from this week and I really needed your pre-speech. Here’s my question – how do you see the 50/50 distribution? I know this isn’t scientific but is it 50% of the whole human experience as negative or 50% on an experience basis? For example; should my expectation be that 50% of my experience in my marriage is challenging with 50% very “easy” and rewarding? 50% of trips to the grocery store on the more challenging side and 50% really pleasant? Or more like 50% of life in general?
Thank you!