CREATE TABLE table_69635 ("Call sign" TEXT, "Frequency MHz" FLOAT, "City of license" TEXT, "ERP W" FLOAT, "Class" TEXT, "FCC info" TEXT)

What call sign has a frequency of 91.3 MHz?
SELECT "Call sign" FROM table_69635 WHERE "Frequency MHz" = '91.3'
SELECT "Call sign" FROM "table_69635" WHERE "Frequency MHz" = '91.3'