CREATE TABLE table_28277 ("Rank" FLOAT, "Runs" FLOAT, "Average" TEXT, "Strike rate" TEXT, "Player" TEXT, "Matches" FLOAT, "Innings" FLOAT, "Period" TEXT)

What was the average when the strike rate is 75.78?
SELECT "Average" FROM table_28277 WHERE "Strike rate" = '75.78'
SELECT "Average" FROM "table_28277" WHERE "Strike rate" = '75.78'