请阅读下面这张Markdown格式的表格并回答问题。同一行中不同列的单元格用'|'分隔，不同行的单元格用'
'分隔。

表格标题:
84 表9：成都商品房2007-2012年1月各月成交面积（万平）     
表格:
| 时间 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 2008.0 | 63.0 | 33.0 | 68.0 | 75.0 | 57.0 | 49.0 | 46.0 | 50.0 | 51.0 | 51.0 | 56.0 | 56.0 |
| 2009.0 | 60.0 | 99.0 | 110.0 | 120.0 | 129.0 | 83.0 | 107.0 | 94.0 | 127.0 | 124.0 | 150.0 | 317.0 |
| 2010.0 | 55.0 | 52.0 | 90.0 | 95.0 | 80.0 | 63.0 | 74.0 | 74.0 | 102.0 | 144.0 | 161.0 | 131.0 |
| 2011.0 | 154.0 | 117.0 | 66.0 | 65.0 | 69.0 | 69.0 | 69.0 | 75.0 | 84.0 | 75.0 | 89.0 | 89.0 |
问题:
成都商品房成交的面积在三月或者四月就超过六十万平米的话，那五月份的平均成交面积为多少呢
Answer:
83.75