What is the average latitude and longitude of all starting stations for the trips?
SELECT avg(T1.lat) ,  avg(T1.long) FROM station AS T1 JOIN trip AS T2 ON T1.id  =  T2.start_station_id
SELECT avg(T1.lat) ,  avg(T1.long) FROM station AS T1 JOIN trip AS T2 ON T1.id  =  T2.start_station_id
[{'avg(T1.lat)': 37.74618133538529, 'avg(T1.long)': -122.36134722346611}]