Average of a set of text data

Why doesn't the formula i'm using allow me to get the average of this set of values?

Formula {=INDEX($C$2:$C$298,MODE(MATCH($C$2:$C$298,$C$2:$C$298,0)))}

Example Image.png


Here's a one drive link for the actual example sheet i made, can't upload from Work PC: https://1drv.ms/x/s!AjprUFOn0j6KhiWtb2FDffoEGnBM


Thanks,
Liam

Can you attach the file to the actual forum? Click 'Go Advanced' - 'Manage Attatchments'