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:
| State | Interview | Swimsuit | Evening Gown | Average |
| --- | --- | --- | --- | --- |
| Idaho | 8.688 | 8.925 | 8.850 | 8.821 |
| Kentucky | 8.863 | 9.175 | 9.400 | 9.146 |
| Vermont | 8.425 | 9.013 | 9.300 | 8.913 |
| Texas | 8.688 | 8.975 | 8.875 | 8.846 |
| North Dakota | 8.800 | 8.975 | 9.175 | 8.983 |
| Washington | 8.688 | 8.788 | 8.863 | 8.779 |
| Alabama | 8.650 | 8.475 | 8.938 | 8.688 |
| South Dakota | 8.300 | 8.838 | 8.513 | 8.550 |
| New York | 8.463 | 8.713 | 8.400 | 8.525 |
| Oklahoma | 8.275 | 8.325 | 8.700 | 8.433 |
Question:
how many state has an average under 8.5?
Answer:
1