# [Vyxal](https://github.com/Vyxal/Vyxal) `Ṁ`, <strike>11</strike> 10  bytes
-1 thanks to [Neil](https://codegolf.stackexchange.com/users/17602/neil)
```
ƛkanḟ;∑?LḊ
```
[Try it Online!](https://vyxal.pythonanywhere.com/#WyLhuYAiLCIiLCLGm2thbuG4nzviiJE/TOG4iiIsIiIsImFiY2IiXQ==)

# Explanation
```
ƛkanḟ;∑?LḊ
ƛ            Start a mapping lambda for input
 ka          Lowercase alphabet
   n         Current letter
    ḟ        Find letter in the alphabet, return index
     ;       Close mapping lambda
      ∑      Sum the list of indices.
       ?L    Get Length of input
         Ḋ   Check if Sum is divisible by the length.
```