cheers for that. i came up with this though, and it works
=IF(A1<24.999,"PASS",IF(A1>=25,"FAIL",IF(A1=NO READING,"FAIL")))
you don't need to nter no reading tho...you could just do...
=IF(A1<25,"PASS",IF(A1>=25,"FAIL","FAIL"))
the commer i've highlighted meaning "if not"