rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 united states 12 13 6 31
the average silver medal count of the first five ranked nations ?
DT JJ NN NN NN IN DT JJ CD VBD NNS .
8
Keyword Keyword Keyword Column Keyword Keyword Keyword Keyword Column Keyword Literal.Number
select avg ( c4_number ) from w where c1_number <= 5
Keyword Keyword Column None Keyword Keyword Keyword Keyword Literal Column None None
['agg', 'agg_avg'] ['agg', 'agg_avg'] c4_number ['agg', 'agg_avg'] ['agg', 'agg_avg'] ['comp', 'comp_lequal'] ['comp', 'comp_lequal'] c1_number