diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b941d6b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+__pycache__
+
+*.ipynb
\ No newline at end of file
diff --git a/squares.py b/squares.py
index d7e454e..b48b07f 100644
--- a/squares.py
+++ b/squares.py
@@ -12,7 +12,7 @@ def average_of_squares(list_of_numbers, list_of_weights=None):
     >>> average_of_squares([1, 2, 4])
     7.0
     >>> average_of_squares([2, 4], [1, 0.5])
-    6.0
+    8.0
     >>> average_of_squares([1, 2, 4], [1, 0.5])
     Traceback (most recent call last):
     AssertionError: weights and numbers must have same length
@@ -21,9 +21,9 @@ def average_of_squares(list_of_numbers, list_of_weights=None):
     if list_of_weights is not None:
         assert len(list_of_weights) == len(list_of_numbers), \
             "weights and numbers must have same length"
-        effective_weights = list_of_weights
+        effective_weights = [val/sum(list_of_weights) for val in list_of_weights]
     else:
-        effective_weights = [1] * len(list_of_numbers)
+        effective_weights = [1/len(list_of_numbers)] * len(list_of_numbers)
     squares = [
         weight * number * number
         for number, weight
@@ -38,7 +38,7 @@ def convert_numbers(list_of_strings):
     Example:
     --------
     >>> convert_numbers(["4", " 8 ", "15 16", " 23    42 "])
-    [4, 8, 15, 16]
+    [4.0, 8.0, 15.0, 16.0, 23.0, 42.0]
 
     """
     all_numbers = []