rank nation gold silver bronze total
rank
nation
gold
silver
bronze
total
number
number
number
number
number
number text number number number number
1 china 13 9 13 35
what is the average number of gold medals won by china , japan , and north korea ?
WP VBD-AUX DT JJ NN IN NN NNS VBN IN NNP , NNP , CC NNP NNP .