CREATE TABLE table_16992 ("Marginal Ordinary Income Tax Rate" TEXT, "Single" TEXT, "Married Filing Jointly or Qualified Widow ( er ) " TEXT, "Married Filing Separately" TEXT, "Head of Household" TEXT)

What is the amount of marginal ordinary income tax rate for single in which the range is $8,351 $33,950?
SELECT COUNT("Marginal Ordinary Income Tax Rate") FROM table_16992 WHERE "Single" = '$8,351– $33,950'
SELECT COUNT("Marginal Ordinary Income Tax Rate") FROM "table_16992" WHERE "Single" = '$8,351– $33,950'