利用pandas分组后不能求平均值,但是可以求最大值,最小值等,为什么

其中问题和代码如下所示

http://img2.mukewang.com/5e564c300001aa1a10440441.jpg

慕粉1473717349
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慕斯4360584

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慕斯4360584

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慕慕5436299

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慕慕5436299

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慕慕5436299

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