CREATE TABLE table_21217 ("Province" TEXT, "Skip" TEXT, "W" FLOAT, "L" FLOAT, "PF" FLOAT, "PA" FLOAT, "Ends Won" FLOAT, "Ends Lost" FLOAT, "Blank Ends" FLOAT, "Stolen Ends" FLOAT, "Shot Pct." FLOAT)

How many values are in the PF cell when Jennifer Jones is skip?
SELECT COUNT("PF") FROM table_21217 WHERE "Skip" = 'Jennifer Jones'
SELECT COUNT("PF") FROM "table_21217" WHERE "Skip" = 'Jennifer Jones'