"U.S. Medical Insurance Costs" Portfolio Project: feedback welcome!

It was fun figuring it out for myself. I did it in a couple of hours and plan on reviewing it later to improve it.
I ended up mostly using pandas, which I don’t know if it was the right choice. The solution provided by Codecademy made more use of classes and functions, which looks better, but I thought pandas could do the same thing more easily. I’m not sure if the results suffered from it, though, which is some of the feedback I hope to get!

Here it is, I included the .ipynb file + the insurance.csv table: