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:
| Peak | Height (m) | Prom. (m) | Class | Parent |
| --- | --- | --- | --- | --- |
| Whernside | 736.0 | 408.0 | Marilyn | Cross Fell |
| Ingleborough | 724.0 | 428.0 | Marilyn | Cross Fell |
| Great Whernside | 704.0 | 288.0 | Marilyn | Whernside |
| Buckden Pike | 702.0 | 207.0 | Marilyn | Great Whernside |
| Pen-y-ghent | 694.0 | 306.0 | Marilyn | Whernside |
| Great Coum | 687.0 | 221.0 | Marilyn | Whernside |
| Plover Hill | 680.0 | 59.0 | Hewitt | Pen-y-ghent |
| Great Knoutberry Hill | 672.0 | 254.0 | Marilyn | Great Whernside |
| Dodd Fell Hill | 668.0 | 230.0 | Marilyn | Great Knoutberry Hill |
| Fountains Fell | 668.0 | 243.0 | Marilyn | Pen-y-ghent |
| Fountains Fell south top | 662.0 | 15.0 | Nuttall | Fountains Fell |
| Simon Fell | 650.0 | 35.0 | Hewitt | Ingleborough |
| Yockenthwaite Moor | 643.0 | 86.0 | Hewitt | Dodd Fell Hill |
| Green Hill | 628.0 | 24.0 | Nuttall | Great Coum |
| Gragareth | 627.0 | 30.0 | Hewitt | Great Coum |
| Darnbrook Fell | 624.0 | 40.0 | Hewitt | Fountains Fell |
| Drumaldrace | 614.0 | 66.0 | Hewitt | Dodd Fell Hill |
| Birks Fell | 610.0 | 158.0 | Marilyn | Pen-y-ghent |
Question:
What is the average height for hewitt class, with prom less than 86, and a Peak of gragareth?
Answer:
627.0