A person is considered "Profoundly mentally retarded" when the IQ Score is?

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E6 Parks TextBook of Preventive & Social Medicine part 2 — Subpart A (pp 1-232 of 464) p. 82-84
E6 Robert Boland, Marcia L. Verduin - Kaplan and Sadock's Comprehensive Text of Psychiatry-Wolters Kluwer Health (2024) (pp 1-16525 of 16525) p. 11763-11765
E6 Kaplan Sadock's Synopsis of Psychiatry-2022 (pp 1-3768 of 3768) p. 310-312
Practise the full RUHS, Jaipur, M.Sc Nursing Entrance Exam-2018
Attempt every question from this paper in a timed mock, then review the full solution for each one.