Help with showing an average results as a letter

[Laura28678190c3pl]

I have no experience with Java script, but we want to be able the average results of our to show as a letter.

For example, Rating: Above Target can equal 3, On Target = 2, Below Target =1.

We want the average of those ratings to show at the bottom of the form as a letter.

So if the average is between 2 and 2.5, then it should be OT(on target), if <2.6 then Above Target, etc. 

I see there's an option for custom calculation, but not sure what to add. Thanks in advance

[Thom Parker]

You'll need to use a script in the custom calculation for the average.

This script assumes the calculation is done in the same field that shows the letters. 

Also, the calculation is not shown, because that part is up to you. 

(On another note, your rule that  "Above Target" is when the ave<2.6 doesn't fit with the first condition.)

var nAverage = ... some calculation ...;

if((nAverage >=2) && (nAverage <= 2.5))
   event.value = "OT";
else if((nAverage >2.5) && (nAverage <= 3.0))
   event.value = "somethign else";
else
  event.value = "N/A";