Yes, you are eligible for admission with 48% marks in graduation at the Indira Gandhi National Open University (IGNOU). Undergraduate, Postgraduate, Diploma, and Certificate courses are available in IGNOU. Some courses need a minimum of 50% marks in graduation, and some need a lower percentage. Some courses may require work experience and entrance test scores. They may have a minimum age requirement apart from the percentage requirement.
So it is better to know the admission process and eligibility criteria on the official website of IGNOU for each of the various courses offered at the university.