Excel division by 0 error when trying to average results of formulas

The problem is you are trying to take an average of text strings.

Change your formula to:

=IF(B3>=0.8,5,IF(B3>=0.7,4,IF(B3>=0.6,3,IF(B3>=0.5,2,1))))

A number wrapped in quotes like "4", is not actually a number, but rather text, you cannot take an AVERAGE of text values.

You can do a simple test to see if a number is actually a number. In D2 use =ISNUMBER(C2) if it returns TRUE, then it is a number.

An Array Formula will solve your problem:

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{=AVERAGE(VALUE(B1:B4))}

N.B.

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