A child of 10 years has a mental age of 2 years, his IQ level is:-

IQ = Mental age /Chronological age x 100 In the given question, chronological age is 10 years and mental age is 2 years. Thus, IQ level of this child= 2/10 x100=20 IQ points. Such a child will be an Idiot child with Severe mental retardation. Normal IQ 70 or above Mild mental retardation = 50-70 Moderate mental retardation = 35-49 Severe mental retardation = 20-34 Profound mental retardation = <20