CREATE TABLE table_6720 ("Rider" TEXT, "Bike" TEXT, "Laps" FLOAT, "Time" TEXT, "Grid" FLOAT)

What is the sum of laps for Karl Muggeridge on a grid less than 16?
SELECT SUM("Laps") FROM table_6720 WHERE "Rider" = 'karl muggeridge' AND "Grid" < '16'
SELECT SUM("Laps") FROM "table_6720" WHERE "Grid" < '16' AND "Rider" = 'karl muggeridge'