question: Return the average, maximum, and minimum budgets in millions for movies made before the year 2000.
#1 return movies 
#2 return years made of  #1 
#3 return #1 where #2 is  before 2000 
#4 return budgets in millions of  #3 
#5 return average of  #4 
#6 return maximum of  #4 
#7 return minimum of  #4 
#8 return #5 ,  #6 ,   #7