Hello,
Another Excel user here.
I can give you two options.
The first one is to create an additional column to translate each of the texts to a numerical value. For example:
Note that I am using =IFS(D7="High",15,D7="Mid",10,D7="Low",5) and filled down to cover all names/marks. Then, to know the average simply use AVERAGE() function.
The second option is to compute the average directly, without the need of the support number column, as follows:
The formulation would be: =AVERAGE((COUNTIF(D7:D9,"High")*15),(COUNTIF(D7:D9,"Mid")*10),(COUNTIF(D7:D9,"Low")*5))
Martin