Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| District | Incumbent | Party | First elected | Result | Candidates |
| --- | --- | --- | --- | --- | --- |
| Arkansas 1 | Ezekiel C. Gathings | Democratic | 1938.0 | Re-elected | Ezekiel C. Gathings (D) Unopposed |
| Arkansas 2 | Wilbur Mills | Democratic | 1938.0 | Re-elected | Wilbur Mills (D) Unopposed |
| Arkansas 3 | James William Trimble | Democratic | 1944.0 | Re-elected | James William Trimble (D) Unopposed |
| Arkansas 4 | William Fadjo Cravens | Democratic | 1939.0 | Re-elected | William Fadjo Cravens (D) Unopposed |
| Arkansas 6 | William F. Norrell | Democratic | 1938.0 | Re-elected | William F. Norrell (D) 84.7% M. O. Evans (I) 15.3% |
Question:
How many districts had William F. Norrell as the incumbent?
Answer:
1.0