I have been trying to work this out for quite a while now, but I can't seem to understand how to solve these kind of questions. Any help (or hint) would be highly appreciated.
Professor Goodheart's colleague Dr. Kremepu gives 3 midterm exams. He drops the lowest and gives each student her average score on the other two exams. Polly Sigh is taking his course and has a 60 on her first exam. Let $x_2$ be her score on the second exam and $x_3$ be her score on the third exam. If we draw her indifference curves for scores on the second and third exams with $x_2$ represented by the horizontal axis and $x_3$ represented by the vertical axis, then her indifference curve through the point ($x_2; x_3$) = (50; 70) is:
- L-shaped with a kink where $x_2 = x_3$.
- three line segments, one vertical, one horizontal, and one running from (70; 60) to (60; 70).
- a straight line, running from (0; 120) to (120; 0).
- three line segments, one vertical, one horizontal, and one running from (70; 50) to (50; 70).
- a V-shaped curve with its point at (50; 70).