A 6 year old child has an IQ of 50. Which of the following tasks should the child be able to perform?

This question expects us to first calculate the child's mental age and then choose the task that can be performed by a six year old child with an IQ of 50. This child has a mental age of 3 years and therefore is capable of identifying colours. Ref: Clinical Review for the USMLE Step 2, Surgisphere Corporation, 2008 - Pg 72; Ghai Essential Pediatrics - 6th Edition, Page 543; UNICEF Guidelines on Child development and Early learning; Nelson's Textbook of Pediatrics 17th Edition, Page 39.