AVERAGE, AVERAGEA, COUNT, COUNTA (and so on) help pages need a fix of the argument names. E.g.: https://help.libreoffice.org/25.8/en-US/text/scalc/01/04060184.html?DbPAR=CALC#bm_id3145824 They show arguments as "Number 1 [; Number 2 [; … [; Number 255]]]". But the arguments are not "number", but anything, including ranges, or text. It would be better to refer to them simply as "Arg 1 [; Arg 2 [; … [; Arg 255]]]", or something like that.
for the non-techies maybe: optional arbitary number of arguments split by $(argument-delimiter) any of them as single-cell-address, range-address or literal number? but yes +1
Olivier Hallot committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/help/commit/89a16829fb0e4cf550bad87c9c27ccc4c89870ef tdf#167841 Arguments of statistical functions