Is there any way to get average values from an array when using a Twig template?

There is no built-in way to do that. Creating your own twig extension that can do it is simple! You need to create a filter, which is very well doumented in the cookbook: How to write a custom Twig Extension.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.