Table:
text: Sailing at the 2008 Summer Olympics – Star class
Competitors
Sortable list of competitors (with (S)kipper and (C)rew noted)
Nation Birth_date Height_m Weight_kg World_Rank
Australia (AUS) 1958-04-14 1.83 110 9
Australia (AUS) 1967-01-26 1.93 96 9
Austria (AUT) 1965-03-01 1.80 90 –
Austria (AUT) 1976-05-26 1.90 108 –
Brazil (BRA) 1973-04-15 1.88 78 6
Brazil (BRA) 1971-07-31 1.85 100 6
China (CHN) 1969-09-29 1.85 85 –
China (CHN) 1988-11-09 1.90 100 –
Croatia (CRO) 1973-06-16 1.86 100 11
Croatia (CRO) 1983-10-16 1.75 100 11
France (FRA) 1968-07-01 1.88 100 8
France (FRA) 1972-04-14 1.94 100 8
Great Britain (GBR) 1976-03-21 1.85 92 12
Great Britain (GBR) 1976-12-17 1.85 104 12
Germany (GER) 1971-12-12 1.96 102 10
Germany (GER) 1971-10-02 1.85 83 10

Question: For 2008 Summer Olympics Sailing - Star Class, what is the nation if the world ranking is 6 and the date of birth is 1971-07-31?

Question: What is the height (m) of sailing at the 2008 Summer Olympics - Star Class if the date of birth is 1968-07-01?