Here is a COUNTIF function with an additional range of values to match at the end. Why does it not work and how can I get it to work.
=COUNTIF('[DATABASE 1.xlsx]Sheet1'!$AC$3:$AC$51877,AND('[DATABASE 1.xlsx]Sheet1'!$AC$3:$AC$51877>=548,'[DATABASE 1.xlsx]Sheet1'!$AC$3:$AC$51877<=554)