fix typo

Author: cliburn

Labs/Lab04/Exercises04-Solutions.ipynb

@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:f158a497d906785b13e6ad9c86f980b4ba055fc70aaa3a636d1a286ab4d9876b"
+  "signature": "sha256:aee1172e66c8feade45decff8735e32df84285d713c2c50fb58173099161922d"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -408,7 +408,7 @@
        ],
        "metadata": {},
        "output_type": "pyout",
-       "prompt_number": 12,
+       "prompt_number": 13,
        "text": [
         "                s1        s2        s3        s4\n",
         "brown     0.287682  0.287682  0.000000  0.000000\n",
@@ -426,7 +426,7 @@
        ]
       }
      ],
-     "prompt_number": 12
+     "prompt_number": 13
     },
     {
      "cell_type": "markdown",