Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_61629 ( "Fin. Pos" real, "Car No." real, "Driver" text, "Team" text, "Laps" real, "Time/Retired" text, "Grid" real, "Laps Led" real, "Points" text )

### Question ###
What is the average grid for Marco Andretti with a finishing position higher than 19?

### Accurate SQL ###

SELECT AVG("Grid") FROM table_61629 WHERE "Driver" = 'marco andretti' AND "Fin. Pos" > '19'