formula for calculation

[Tripleseas]

Hello,

I have the F9 cell that calculate the cumulations of data. so whenever i add a new data i want the F9 cell to update
however, is there a way to do this without creating another cell. when i put the formula on F9 i get an error

thank you

Classeur1
	E	F	G	H	I
5	New DATA	20
6
7
8
9	CUMUL	100	120
10		formula in this cell without adding another cell
11
Feuil1

Cell Formulas
Range	Formula
G9	G9	=F9+F5

 

[Deek6t8]

If you insert table containing all the data and add a total row then whenever you add in new data it will auto include it in the total.