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:
| Driver | Constructor | Laps | Time/Retired | Grid |
| --- | --- | --- | --- | --- |
| Michael Schumacher | Ferrari | 55.0 | 1:47:34.801 | 1.0 |
| Rubens Barrichello | Ferrari | 55.0 | +23.660 | 2.0 |
| David Coulthard | McLaren - Mercedes | 55.0 | +28.555 | 8.0 |
| Heinz-Harald Frentzen | Jordan - Honda | 55.0 | +46.543 | 9.0 |
| Ralf Schumacher | Williams - BMW | 55.0 | +48.233 | 3.0 |
| Mika Häkkinen | McLaren - Mercedes | 55.0 | +48.606 | 4.0 |
| Jos Verstappen | Arrows - Asiatech | 55.0 | +1:21.560 | 18.0 |
| Jarno Trulli | Jordan - Honda | 54.0 | +1 Lap | 5.0 |
| Jean Alesi | Prost - Acer | 54.0 | +1 Lap | 13.0 |
| Luciano Burti | Jaguar - Cosworth | 54.0 | +1 Lap | 15.0 |
| Jenson Button | Benetton - Renault | 53.0 | +2 Laps | 17.0 |
| Gastón Mazzacane | Prost - Acer | 53.0 | +2 Laps | 19.0 |
| Fernando Alonso | Minardi - European | 52.0 | +3 Laps | 21.0 |
| Tarso Marques | Minardi - European | 51.0 | +4 Laps | 20.0 |
| Giancarlo Fisichella | Benetton - Renault | 31.0 | Fuel Pressure | 16.0 |
| Jacques Villeneuve | BAR - Honda | 3.0 | Spun off | 7.0 |
| Nick Heidfeld | Sauber - Petronas | 3.0 | Spun off | 11.0 |
| Enrique Bernoldi | Arrows - Asiatech | 3.0 | Spun off | 22.0 |
| Juan Pablo Montoya | Williams - BMW | 3.0 | Spun off | 6.0 |
| Eddie Irvine | Jaguar - Cosworth | 3.0 | Water Leak | 12.0 |
| Olivier Panis | BAR - Honda | 1.0 | Oil Leak | 10.0 |
| Kimi Räikkönen | Sauber - Petronas | 0.0 | Driveshaft | 14.0 |
Question:
What is the mean number of laps when time/retired was spun off and the driver was Nick Heidfeld?
Answer:
3.0