Task: Question Decomposition
Input (English): question: How many points difference is the IQ range in 17-year-old black students?
Output (English): #1 return 17-year-old black students 
#2 return IQ in  points of #1 
#3 return the  highest of #2 
#4 return the  lowest of #2 
#5 return the  difference of #3 and  #4