What is the average amount of donations by people who donated in the project "Recording Rockin' Readers"
average amount of donations = divide(sum(donation_to_project), count(donor_acctid)); project "Recording Rockin' Readers" refers to title = 'Recording Rockin' Readers'
SELECT AVG(T3.donation_to_project) FROM essays AS T1 INNER JOIN projects AS T2 ON T1.projectid = T2.projectid INNER JOIN donations AS T3 ON T2.projectid = T3.projectid WHERE T1.title = 'Recording Rockin'' Readers'