A 16 year old child with an IQ of around 75 is not indicative of the overall level of intellectual development, so there is no way to tell if it is normal. The IQ score alone cannot determine whether a child has an intellectual problem, because there is some variability in IQ at different ages, which may recover slowly with age. Therefore, a 16-year-old child with an IQ of about 75 cannot indicate the overall level of intellectual development, so it is not possible to determine whether it is normal or not, and it is necessary to carry out specialized tests to clarify whether the child’s intellectual level is normal or not. A simple IQ test does not reflect the child’s true level of intelligence, the developing child’s intelligence is in a state of gradual growth, it is recommended that specialist consultation, you can through the Wechsler scale, Stanford-Binet scale and other intelligence tests for children, if it is clear that the level of intelligence is low, you need to actively cooperate with the doctor’s treatment.