minor edit to midters-revised

Author: cliburn

Exams/Midterm-Revised-Solutions.ipynb

@@ -1,7 +1,7 @@
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-  "signature": "sha256:b4398dfaf1554967f089ea3c893388d6d4ad4cf239d6ef2c26743b6ce4f23b27"
+  "signature": "sha256:1c1e6d9aa15a45f4f523c56bdc0b7ae7c28f032f41fabebc214e87927d3146e5"
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@@ -207,7 +207,7 @@
       "2. What is the vector representing the first principal component direction? (2 points)\n",
       "3. Find $A^{-1}$ without performing a matrix inversion. (2 points)\n",
       "4. What are the coordinates of the data points (0, 1) and (1, 1) in the standard basis expressed as coordinates of the principal components? (2 points)\n",
-      "5. What is the explained variance if we keep only the projection onto the first principal component? (2 points)."
+      "5. What is the proportion of variance explained if we keep only the projection onto the first principal component? (2 points)."
      ]
     },
     {