Question: What is the sum of Points for 250cc class, ranked 13th, later than 1955?
SQL: SELECT SUM("Points") FROM "2-15892903-2" WHERE "Class" = '250cc' AND "Rank" = '13th' AND "Year" > 1955.0;

Question: What is the Class for a year later than 1958, with 4 points?
SQL: SELECT "Class" FROM "2-15892903-2" WHERE "Year" > 1958.0 AND "Points" = 4.0;

Question: What is the average Year when there were more than 3 points, for MV Agusta and ranked 10th?
SQL: SELECT AVG("Year") FROM "2-15892903-2" WHERE "Points" > 3.0 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 "2-15892903-2" WHERE "Class" = '350cc' AND "Points" < 13.0 AND "Year" = 1959.0;