Solution

mean_var_std.py

@@ -1,8 +1,18 @@
 import numpy as np
 
-def calculate(list):
 
-
+def calculate(nums):
-
+    if len(nums) != 9:
-
+        raise ValueError("List must contain nine numbers.")
-    return calculations
+    array = np.array(nums)
+    array = array.reshape((3, 3))
+    calculations = {
+        'mean': [array.mean(axis=0), array.mean(axis=1), array.mean()],
+        'variance': [array.var(axis=0), array.var(axis=1), array.var()],
+        'standard deviation': [
+            array.std(axis=0), array.std(axis=1), array.std()],
+        'max': [array.max(axis=0), array.max(axis=1), array.max()],
+        'min': [array.min(axis=0), array.min(axis=1), array.min()],
+        'sum': [array.sum(axis=0), array.sum(axis=1), array.sum()]
+    }
+    return calculations