Can I use an arrayformula with a split arrayformula inside it?

Question

Trying to break apart rows containing numbers like "198,183,158,315,274" by their comma, and then average them out and divide them by a singular number; using arrayformula. It only produces one row of result and it's incorrect though?

Here is my test sheet, editable

Thanks for any help.

Answer 1

try:

=ARRAYFORMULA({"Average"; IF(A4:A="",,
 IFNA((MMULT(1*IFERROR(SPLIT(INDIRECT("A4:A"&
 MAX(IF(A4:A="",,ROW(A4:A)))), ",")), 
 ROW(INDIRECT("A1:A"&COLUMNS(SPLIT(A4:A, ","))))^0)/
 (1+LEN(REGEXREPLACE(A4:A&"", "[0-9\. ]", ))))/B1))})

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spreadsheet demo

Answer 2

Another solution:

=ArrayFormula({"Average";(ArrayFormula(mmult(N(array_constrain(ArrayFormula(IFERROR(SPLIT(A4:A8,","))),MATCH(2,1/(A4:A8<>""),1),5)),sequence(Columns(ArrayFormula(IFERROR(SPLIT(A4:A8,",")))),1)^0)/mmult(N(array_constrain(if(ArrayFormula(IFERROR(SPLIT(A4:A8,",")))>0,1,0),MATCH(2,1/(A4:A8<>""),1),5)),sequence(columns(ArrayFormula(IFERROR(SPLIT(A4:A8,",")))),1)^0)))/$B$1})