diff --git a/100_Numpy_exercises_with_solutions.md b/100_Numpy_exercises_with_solutions.md
index 010a18ce..1b99299f 100644
--- a/100_Numpy_exercises_with_solutions.md
+++ b/100_Numpy_exercises_with_solutions.md
@@ -188,9 +188,10 @@ print(Z)
 
 
 ```python
-Z = np.random.random((5,5))
-Z = (Z - np.mean (Z)) / (np.std (Z))
-print(Z)
+x = np.random.random((5,5))
+xmax, xmin = x.max(), x.min()
+x = (x - xmin)/(xmax - xmin)
+print(x)
 ```
 #### 23. Create a custom dtype that describes a color as four unsigned bytes (RGBA) (★☆☆)
 
@@ -1243,4 +1244,4 @@ 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)
-```
\ No newline at end of file
+```