# A class with 30 students enrolled is given a homework question with five questions. The first four

A class with 30 students enrolled is given a homework

assignment with five questions. The first four are the usual kinds of problems,

totaling to 90 points. But the fifth is an interactive game for the class. The

question reads: “You can choose whether to answer this question. If you choose

to do so, you merely write ‘I hereby answer Question 5.’ If you choose not to

answer Question 5, your score for the assignment will be based on your

performance on the first four problems. If you choose to answer Question 5,

then your scoring will be as follows: If fewer than half of the students in the

class answer Question 5, you get 10 points for Question 5; 10 points will be

added to your score on the other four questions to get your total score for the

assignment. If half or more than half of the students in the class answer

Question 5, you get 210 points; that is, 10 points will be subtracted from your

score on the other questions.”

(a) Draw a diagram illustrating the payoffs from the two

possible strategies, “Answer Question 5” and “Don’t Answer Question 5,” in

relation to the number of other students who answer it. Find the Nash

equilibrium of the game.

(b) What would you expect to see happen in this game if

it were actually played in a college classroom? Why? Consider two cases: (i)

the students make their choices individually with no communication; and (ii)

the students make their choices individually but can discuss these choices

ahead of time in a discussion forum available on the class Web site.