21-370: Final Statistics

Here are the final Statistics for the semester. You can see grade cutoffs for each exam and for cumulative averages. It also shows grade distrubutions for each of the exams.

21-260: Final Statistics

Here are the final Statistics for the semester. You can see grade cutoffs for each exam and for cumulative averages. It also shows grade distrubutions for each of the exams.

21-370: Stock price for HW#9

As I announced in class, the initial stock price for the third homework problem is S₀=8. I've updated the assignment to reflect this.

UPDATE: I've also made a correction to problem 1. X_n+1(H)=g_n(X_n) and X_n+1(T)=h_n(X_n).

21-370: Homework - Wek #9

The reading and homework assignments for Week #9 have been posted. The reading is from a set of notes written by Profs. Hrusa and Kramkov. I've posted a pdf file of the notes. The homework assignment is also a downloadable pdf. Since I've posted this late this week, I'll give you until Friday to complete the assignment this week. You can follow the links from the Schedule page.

21-260: Week #6

The reading and homework assignments for Week #6 have been posted. You can follow the link from the schedule page.

21-370: Week #5

The reading and homework assignment for Week #5 have been posted.

21-260: Week #4

The reading and homework assignments for Week #4 have been posted. Follow the link from the Schedule page.

21-370: Homework - Week#4

The reading and homework assignments for Week #4 have been posted. You can follow the link from the Schedule page.

21-260: Pay No Attention to the Hint for Problem 2.1.23b

The WileyPLUS "Hint" for this problem is incorrect. The "transition from one type of behavior to another" is this: for some initial conditions, the solutions increase without bound as t approaches infinity; for other initial conditions, the solutions decrease without bound. You want to find the initial condition y(0)=a_0 that identifies the solution that separates these two types of behavior. The solution doesn't involve finding derivatives and setting them equal to zero.

21-260: Dfield and Wiley Support

First, the dfield applet I used in class today is available from this site.

Second, you can contact WileyPLUS customer support to submit a question or use their live chat feature. This should help you get the help you need in a more timely fashion.