Pivot tables in excel

I am having problems figuring the average of the book titles in country per decade. I’ve have gone through the slide show several times, and I still can’t figure out the answer.
I would really appreciate the help!
Thank you
Leslie Da Silva

Can you please include a link to the lesson and what excel code you’ve written so far?
(Maybe a screen shot of the sheet)

Hi Lisa!
Thank you so much for replying. I am having such a hard time understanding this practice, and really appreciate your help.
Here is the link for the pivot table

pivot table

Best Regards