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:
| Name | Builder | Type | Date | Works number |
| --- | --- | --- | --- | --- |
| Snowdon Ranger | Vulcan Foundry | 0-6-4T | 1875.0 | 739.0 |
| Moel Tryfan | Vulcan Foundry | 0-6-4T | 1875.0 | 738.0 |
| Beddgelert | Hunslet | 0-6-4ST | 1878.0 | 206.0 |
| Russell | Hunslet | 2-6-2T | 1906.0 | 901.0 |
| Gowrie | Hunslet | 0-6-4T | 1908.0 | 979.0 |
Question:
What is the average work number of Snowdon Ranger with the builder Vulcan Foundry?
Answer:
739.0