question: What are the average, minimum, and maximum ticket prices for exhibitions that happened prior to 2009?
#1 return exhibitions 
#2 return #1 that  happened prior to 2009 
#3 return ticket prices for #2 
#4 return average of  #3 
#5 return minimum of  #3 
#6 return maximum of  #3 
#7 return #4 ,  #5 ,   #6