Mrs. Mitchell gives a test. Six of her scores are 78, 85,85,87,90, and 93. she finds a mistake in her grading and gives everyone 5 extra points on their grade What increases by 5?_ _ _
what stays the same? _ _ _

1. Mean 2. Median 3. Mode 4. Range

Let be the amount of parts the student answered correctly.  Suppose that is a function between and the score of a student's project.  As the student initially receives a fixed points for turning the project in and points for each correct part, the function is initially:

When the students receive points for each correct part, the coefficient of changes, as the amount of points received per correct answer increases.  Thus:

.