Yes you should state 75 instead of 7.5 (so do not use punctuation).
Jouw verzoek: / Your question:
Datum verzonden: 6-dec-2017 6:24
Naar: io@tue.nl
Onderwerp: Inquiry from an applicant for a master program at TU/e
Dear Madam/Sir,
Thanks for reading my email.
I am an applicant for a master program at TU/e. When I am inputting my IELTS scores into the OSIRIS application system, I am confronted with a problem. The system does not allow me to input the IELTS score with a punctuation (e.g. 7.5), so what is the right format to input the IELTS score with the decimal point?