oops, it seems to evaluate from left to right with no operator precedence. Not exactly something one would guess.
so this edit works - I was too lazy to reenter the expression (since I can’t edit it by hand and have to construct it again step-by-step manually, so I changed all divisions to /1 and kept the last to /4)
it would be best if I could merge all those 4 items and get the average of them. See my suggestion at :merged-with modifier for single items too, not for lists only for this one. Would allow to make lists on the fly from standalone values (could even have :merged-with modifier for literals so that you could quickly combine some in a list with other dynamic items and then get some calculated value from it like sum, average etc.)