Table: dave_chadwick_1955_stats
Columns: year
class
team
points
rank
wins

Question: What is the sum of Points for 250cc class, ranked 13th, later than 1955?
SQL: SELECT SUM("points") FROM dave_chadwick_1955_stats WHERE "class" = '250cc' AND "rank" = '13th' AND "year" > 1955

Question: What is the Class for a year later than 1958, with 4 points?
SQL: SELECT "class" FROM dave_chadwick_1955_stats WHERE "year" > 1958 AND "points" = 4

Question: What is the average Year when there were more than 3 points, for MV Agusta and ranked 10th?
SQL: SELECT AVG("year") FROM dave_chadwick_1955_stats WHERE "points" > 3 AND "team" = 'mv agusta' AND "rank" = '10th'

Question: What Team has a Class of 350cc, with less than 13 points in 1959?
SQL: SELECT "team" FROM dave_chadwick_1955_stats WHERE "class" = '350cc' AND "points" < 13 AND "year" = 1959