Homework 5.3

Author: pfryga

hw5.3/README.md

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+# Homework 5.3
+
+Who's the easiest grader on campus?
+A set of grades are loaded into the grades collection.
+
+The documents look like this:
+
+
+````
+{
+    "_id" : ObjectId("50b59cd75bed76f46522c392"),
+    "student_id" : 10,
+    "class_id" : 5,
+    "scores" : [
+        {
+            "type" : "exam",
+            "score" : 69.17634380939022
+        },
+        {
+            "type" : "quiz",
+            "score" : 61.20182926719762
+        },
+        {
+            "type" : "homework",
+            "score" : 73.3293624199466
+        },
+        {
+            "type" : "homework",
+            "score" : 15.206314042622903
+        },
+        {
+            "type" : "homework",
+            "score" : 36.75297723087603
+        },
+        {
+            "type" : "homework",
+            "score" : 64.42913107330241
+        }
+    ]
+}
+````
+
+There are documents for each student (student_id) across a variety of classes (class_id). Note that not all students in the same class have the same exact number of assessments. Some students have three homework assignments, etc.
+
+Your task is to calculate the class with the best average student performance. This involves calculating an average for each student in each class of all non-quiz assessments and then averaging those numbers to get a class average. To be clear, each student's average includes only exams and homework grades. Don't include their quiz scores in the calculation.
+
+What is the class_id which has the highest average student performance?
+
+Hint/Strategy: You need to group twice to solve this problem. You must figure out the GPA that each student has achieved in a class and then average those numbers to get a class average. After that, you just need to sort. The class with the lowest average is the class with class_id=2. Those students achieved a class average of 37.6
+
+If you prefer, you may download the handout and perform your analysis on your machine with
+
+````
+mongoimport -d test -c grades --drop grades.json
+````
+
+* 8
+* 9
+* 1
+* 5
+* 7
+* 0
+* 6
+
+### Response
+
+````
+
+````
+
+*
+
+