Merge pull request #169 from mgoloshchapov/patch-3

Update 100_Numpy_exercises_with_solutions.md

100_Numpy_exercises_with_solutions.md

@@ -178,7 +178,7 @@ print(np.unravel_index(99,(6,7,8)))
 
 
 ```python
-Z = np.tile( np.array([[0,1],[1,0]]), (4,4))
+Z = np.tile(np.eye(2), (4,4))
 print(Z)
 ```
 #### 22. Normalize a 5x5 random matrix (★☆☆)
@@ -1205,4 +1205,4 @@ idx = np.random.randint(0, X.size, (N, X.size))
 means = X[idx].mean(axis=1)
 confint = np.percentile(means, [2.5, 97.5])
 print(confint)
-```
+```