I'm trying to add values into the 'Overall' column using both if-else and for-loop, however it doesn't seem to work. 

I'm using the values from the 'Total' Column of my DataFrame to determine the 'Overall'column value either a Pass or a Fail.]

```
    for index, row in Score.iterrows():
         if Score['Total']>=100:
            Score.insert(index,'Overall', 'Pass')
          else:
            Score.insert(index,'Overall', 'Fail')

        Name    Maths   English Total   Overall
    0   Tom        50   50      100 
    1   Jack       80   50      130 
    2   Tim        70   80      150 
    3   Hen         1   84      85  

```

[Attached picture of the problem](https://i.stack.imgur.com/fZ133.png)

[![enter image description here](https://i.stack.imgur.com/fZ133.png)](https://i.stack.imgur.com/fZ133.png)