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:
| Poll source | Dates administered | Tom Emmer (R) | Matt Entenza (DFL) | Tom Horner (I) | Undecided | Sampling error |
| --- | --- | --- | --- | --- | --- | --- |
| Survey USA | August 2-4, 2010 | 33% | 38% | 12% | 17% | 2.7% |
| Minnesota Poll | July 26-29, 2010 | 31% | 36% | 15% | 17% | 4.3% |
| Rasmussen Reports | July 19, 2010 | 36% | 37% | 12% | 15% | 4.5% |
| Survey USA | June 14-16, 2010 | 37% | 33% | 12% | 18% | 2.5% |
| Decision Resources, Ltd. | May 28 - June 2, 2010 | 27% | 34% | 19% | 20% | 3.5% |
| Rasmussen Reports | May 24, 2010 | 37% | 34% | 12% | 17% | 4.5% |
| Humphrey Institute / MPR | May 13-16, 2010 | 32% | 28% | 11% | 29% | 5.8% |
| Survey USA | May 3-5, 2010 | 42% | 31% | 10% | 16% | 4.1% |
Question:
What's the percentage of undecided according to the poll source with sampling error of 2.7%?
Answer:
17%