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 5 6 5 16
what is the average number of gold medals won by the top 5 nations ?
WP VBD-AUX DT JJ NN IN NN NNS VBN IN DT JJ CD NNS .
2.6
select avg ( c3_number ) from w where c1_number <= 5