How to find the averages of sections of large lists

so i have a list with 2200 entries on it, i want to find the averages of all 100, 22 entry long sections in this list. i have organized this list into a graph 2200 units long graph, i want to make a new list from this one with the average of the spaces between the blue lines. if any specification is needed i can discus in the comments.

You can use something along the lines of:
[mean(R[i...i+100]) for i=[1,101,...,2100]]
assuming your list is stored in R.

that’s exactly what i wanted! i kept on getting “you cannot store a list inside of a list” errors, thank you.