how do I find the proportion of the total respondents who were aged less than 45 in pandas?
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Anonymous 1975 
how do I find the proportion of the total respondents who were aged less than 45 in pandas?

I have tried this code till now

```python
survey['age_45']=(survey['age'] < 45)
survey['result']=(survey['age_45']  / survey ['age'].count())*100
survey['result']
```
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