Final grades are posted

Hi everyone,

Final grades for the course have been posted in the “Grades” area. ¬†These grades were submitted to the CUNYFirst system on Saturday, May 26th. ¬†I am not sure when they will be available to you on CUNYFirst — if not immediately, hopefully within a day or two.

I wish you all the very best in your future academic pursuits – it was a pleasure working with you this semester.

Best regards,
Mr. Reitz

Updated Final Exam Review Sheet

Early this morning I received an email from the Math Department with an updated Final Exam Review Sheet for MAT 1272.  The good news is that it is very similar to the review sheet we have been using in class Рso if you can do the review sheet that I handed out, you will be mostly well prepared for the final.  However, there are two problems on the new sheet that are quite different from problems on the old sheet, #10 and #11. Here they are:

10) Of a company’s employees, 35% are women and 8% are married women. ¬†Suppose an employee is selected at random. ¬†Given that the selected employee is a woman, what is the probability that she is married?


ANS: 0.2286


11) A recent undergraduate student has applied to graduate schools of two universities, A and B.  The student feels that she has a 60% chance of receiving an offer from university A and a 50% chance of receiving an offer from university B.  If she receives an offer from university B, she believes that she has an 80% chance of receiving an offer from university A.
a) What is the probability that both universities will make her an offer?
b) What is the probability that at least one university will make her an offer?
c) If she receives an offer from university B, what is the probability that she will not receive an offer from university A?


ANS: a) 0.4, b) 0.7, c) 0.2

HINT:  Both of these problems rely on the formulas related to combining probabilities:

Multiplication Rule:  P(A\: and \: B) = P(A) \cdot P(B|A)
Addition Rule: P(A\: or\: B) = P(A) + P(B) - P(A\: and\: B)
Conditional Probability: P(B|A) = \frac{P(A\: and\: B)}{P(A)}


Rubric (grading guide) – OpenLab Final Project

The link below will take you to the grading rubric for your OpenLab Final Project. ¬†The project is worth 15 points altogether, the equivalent of three OpenLab assignments, and the rubric explains how I will assign those 15 points (5 points in each of 3 different categories). You may wish to invest 15 minutes of your time in reading through it — knowing how I will grade the project can be a great benefit when you are setting out to complete it (knowledge is power!).

Grading Rubric for OpenLab Final Project: Final Exam Study Guide


Hi everyone,

A few people were having trouble with problem #1 — webwork was not accepting the test statistic, even though their calculations were correct. ¬†I have updated the problem to give a more accurate xbar (that is, it now shows 3 decimals instead of 2), and if you use this to calculate the test statistic it should solve the problem. ¬†If it doesn’t, please let me know. ¬†Apologies for the inconvenience.


Mr. Reitz

OpenLab final project: Final Exam Study Guide

EDIT:  Since all the Final Exam Review problems are now spoken for, please choose a problem from Exam Review #3, problems 6-12.

List updated Thursday, May 16, 2pm to include current list of CLAIMED PROBLEMS (see the bottom of the post for the list).

Assignment (Due Thursday, May 16, 2:30pm).  Create a study guide for one problem on the final exam.  This project will take the place of all remaining OpenLab assignments (it will count for 3 assignments overall), and consists of the three tasks described below.

Your audience is your classmates and other CityTech students taking MAT 1272. 


  1. Choose a problem, and claim it by replying to this message.  Choose a problem from the final exam review sheet that you would like to work on Рbut do NOT choose problems #17, 21, or 26 (these will be covered in the final days of the semester).  Only one person may work on each problem, and they are assigned on a first-come, first-served basis.  To claim your problem, reply to this post and include your name and the problem number you want.  Please look through the replies that have already been posted Рif your problem is already taken, you must choose another.
  2. Solve the problem.  Write an explanation, in words, of each step of the problem, and then show the the results of each calculation. Include any advice you can think of that might help fellow students, for example how you knew what type of problem it was, or how you knew what to do next!
    Stuck?  Ask for help!  You are encouraged to talk to your classmates, to tutors, or to Mr. Reitz about your problem and solution.
  3. Create a new blog post with your solution. Do NOT reply to this post with your solution.  Instead, create a new blog post with your solution.  Your grade for this assignment will be based on your post.  Instructions for creating a blog post appear below.

Read the following instructions carefully and completely. 

You will create a new blog post on our OpenLab site. ¬†You create a new blog post by logging in to the site, and clicking on the gray circle with a “+” plus sign at the very top of the screen (and selecting “Post”). ¬†Once you have created and published a post, you can find it on the Home page of the site. You CAN make changes to a post, even after it appears on the site.

Your post should include the following:

TITLE: Study Guide for Problem # (insert your problem number here)

BODY: include the following in the body of your post

  • your name
  • the problem you chose to work on (please include the entire problem)
  • step-by-step solution, with explanations and results of each calculation

TAGS: please add the following tags to your post (using the box on the right). ¬†1. “study guide”, 2. topic (for example “hypothesis testing”, or “probability” – there are many options, and you can include more than one), 3. plus any other tags you think are appropriate

Don’t forget to click the blue “Publish” button on the right side of the screen to make your post public. ¬†You can also use the “Save Draft” option, which will save it without making it public (to find it later, go to the Dashboard and click “Posts” on the left side).

Feel free to post questions on the OpenLab if you have them.



CLAIMED PROBLEMS (Updated Thursday, May 16, 2:00pm):

1 Glen Moore
2 Julieann McGonigle
3 Tanzima Mursalin
4 Erica Press
5 Barbara George
6 Ram Rampersad
7 Brianna Mahoney
8 Jenny Soriano
9 Valerie Cabezas
10 America Hernandez
11 Craig Shaw
12 Anil Dipu
13 Adriana Mandelburger
14 Candice Wright
15 Anthony Marc
16 Melissa Alteon
17 xx
18 Garfield Gray
19 sessa
20 Dania Elder
21 xx
22 Zinaida Ashurova
23 Fatima Elmachatt
24 Mary Fung
25 Mohammed Ahmed
26 xx

Exam Review #3 (Problems 6-12 only)
6 Elizabeth Fitts
7 Laticia Bourne
8 Jacky Xu
12 Edward Zheng


The short version:  Exam #3, which was scheduled for tomorrow (Thursday, 4/25), is now postponed until next Tuesday, 4/30.

The long version:  My daughter Sierra is undergoing surgery on Tuesday and so I will not be in class (luckily it is not a major operation, just a followup to a prior procedure, but she will be under full anesthesia and will stay in the hospital all day).  It makes more sense to have the sub give the exam, rather than cover new material.  Therefore, tomorrow in class I will be covering new material (which will not be on the exam).  I do have office hours tomorrow from 11:30 Р12:30 (in N707), and I will do my best to come to class a few minutes early and answer questions.  For those of you who requested additional time to study, you are in luck!

My apologies for the very late notice – we weren’t informed of the surgery date until today.

-Mr. Reitz

WeBWorK #11

Hi everyone,

WeBWorK assignment #11, which is based on the material covered in class today (“sample means”), is now available. ¬†It will be due next Tuesday evening, 4/30/13. ¬†Please do not work on it until after the exam on Thursday. ¬†Indeed, it would be best if you did not even read this message until after the exam. ¬†Best of luck with your studying.

– Mr. Reitz

Update on WeBWorK #10

I have rewritten the WeBWorK #10 assignment – the problems are based on section 5.5 (which we studied on Thursday), and are much more similar to what will be on the exam next week. ¬†The assignment is now available, and is due on Tuesday night at midnight. ¬†Don’t hesitate to write if you have questions.

Take care,
Mr. Reitz