Update some snippets

snippets/average.md

@@ -1,16 +1,15 @@
 ---
 title: average
-tags: math
+tags: math,list,beginner
 ---
-:information_source: Already implemented via `statistics.mean`. `statistics.mean` takes an array as an argument whereas this function takes variadic arguments.
 
 Returns the average of two or more numbers.
 
-Takes the sum of all the `args` and divides it by `len(args)`. The second argument `0.0` in sum is to handle floating point division in `python3`.
+Use `sum()` to sum all of the `args` provided, divide by `len(args)`.
 
 ```py
 def average(*args):
-    return sum(args, 0.0) / len(args)
+  return sum(args, 0.0) / len(args)
 ```
 
 ```py