Mentally Impaired , in Minnesota Special Education Due Process Standards  Manual, means significantly
        sub-average general intellectual functioning existing concurrently with deficits in adaptive behavior
        and manifested during the developmental period that adversely affects a child's educational performance.

                                    In short, a person with mild-moderate mentally handicapped will have an
                intelligence quotient below 70. Whereas a person with moderate-severe mentally
                                     handicapped will have an intelligence quotient below 50 on a standardized intelligence test.