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:
| Year | Entrant | Chassis | Engine | Points |
| --- | --- | --- | --- | --- |
| 1950.0 | I R C | Maserati | Maserati L4 | 0.0 |
| 1951.0 | Central Excavating | Trevis | Offenhauser L4 | 0.0 |
| 1952.0 | Fuel Injection | Kurtis Kraft KK500A | Offenhauser L4 | 1.0 |
| 1953.0 | Fuel Injection | Kurtis Kraft KK500A | Offenhauser L4 | 9.0 |
| 1954.0 | Fuel Injection | Kurtis Kraft KK500A | Offenhauser L4 | 8.0 |
| 1955.0 | Hopkins | Kurtis Kraft KK500C | Offenhauser L4 | 1.0 |
Question:
What is the average number of points for an Offenhauser L4 engine with a Trevis chassis?
Answer:
0.0