CREATE TABLE player (pid DECIMAL, pname TEXT, ycard TEXT, hs DECIMAL)
CREATE TABLE tryout (pid DECIMAL, cname TEXT, ppos TEXT, decision TEXT)
CREATE TABLE college (cname TEXT, state TEXT, enr DECIMAL)

Find the average hours for the students whose tryout decision is no.
SELECT AVG(T1.hs) FROM player AS T1 JOIN tryout AS T2 ON T1.pid = T2.pid WHERE T2.decision = 'no'
SELECT AVG("T1"."hs") FROM "player" AS "T1" JOIN "tryout" AS "T2" ON "T1"."pid" = "T2"."pid" AND "T2"."decision" = 'no'