Find the average and maximum hours for the students whose tryout decision is yes.
SELECT avg(T1.HS) ,  max(T1.HS) FROM player AS T1 JOIN tryout AS T2 ON T1.pID  =  T2.pID WHERE T2.decision  =  'yes'
Deneme kararı evet olan öğrenciler için ortalama ve maksimum saatleri bulun.