How many penalty minutes did the Montreal Canadiens have on average in the Stanley Cup Finals?
AVG(PIM) = DIVIDE(SUM(PIM), COUNT(G)); Montreal Canadiens is name of team;
SELECT CAST(SUM(T2.PIM) AS REAL) / COUNT(T2.PIM) FROM Teams AS T1 INNER JOIN TeamsSC AS T2 ON T1.tmID = T2.tmID AND T1.year = T2.year WHERE T1.name = 'Montreal Canadiens'