CREATE TABLE table_52897 ("Evaluation average  ( From February 2011 ) " FLOAT, "Evaluation average  ( From April 2009 ) " CLOB, "Evaluation average  ( Before April 2009 ) " CLOB, "% of negative evaluations" CLOB, "Submitting schedule on time" CLOB, "Punctuality/Attendance issues" CLOB, "Peak lessons taught" FLOAT)

What is the mean Evaluation number (before April 2009) when the Peak lessons taught was less than 80 and the negative percentage of evaluations was 0.8%?
SELECT "Evaluation average (Before April 2009)" FROM table_52897 WHERE "Peak lessons taught" < '80' AND "% of negative evaluations" = '0.8%'
SELECT "Evaluation average (Before April 2009)" FROM "table_52897" WHERE "% of negative evaluations" = '0.8%' AND "Peak lessons taught" < '80'