Describes the cause and action for error messages.
Error Message(English)：
average if does not work
How to use the Excel AVERAGEIF function | Exceljet
https://exceljet.net/excel-functions/excel-averageif-function
Excel formula: Average numbers ignore zero | Exceljet
https://exceljet.net/formula/average-numbers-ignore-zero
Excel AVERAGE, AVERAGEIF and AVERAGEIFS functions to ...
https://www.ablebits.com/office-addins-blog/2015/08/28/excel-average-averageif/
How to average with errors in excel - YouTube
https://www.youtube.com/watch?v=1Jon2TvTkG8
https://www.youtube.com/watch?v=1Jon2TvTkG8
Using the AVERAGEIF Function in Excel - YouTube
https://www.youtube.com/watch?v=_1R1vRGe4Tk
https://www.youtube.com/watch?v=_1R1vRGe4Tk
AVERAGEIFS does not work, but AVERAGE(IF( does - Stack Overflow
https://stackoverflow.com/questions/28591757/averageifs-does-not-work-but-averageif-does
Excel: AVERAGEIFS with pairs of criteria linked, AND not ...
https://stackoverflow.com/questions/53250556/excel-averageifs-with-pairs-of-criteria-linked-and-not-・・・