What is the average rating of the podcast "Please Excuse My Dead Aunt Sally"?
"Please Excuse My Dead Aunty Sally" is the title of podcast; Average rating = Divide (Sum(rating), Count(rating))
SELECT AVG(T2.rating) FROM podcasts AS T1 INNER JOIN reviews AS T2 ON T2.podcast_id = T1.podcast_id WHERE T1.title = 'Please Excuse My Dead Aunt Sally'