SELECT avg(weight) ,  min(weight) ,  sex FROM people GROUP BY sex
Find the average and minimum weight for each gender.
[Schema (values) (types)]: | candidate_poll |  candidate : candidate_id (text) , people_id (number) , poll_source (number) , date (text) , support_rate (text) , consider_rate (number) , oppose_rate (number) , unsure_rate (number) | people : people_id (text) , sex (number) , name (number) , date_of_birth (text) , height (text) , weight (number);