The two rules for rounding numbers are
Round your numbers only once (in one step), and
Round 5's to the nearest even digit -- up or down as needed.
Below I explain why.
In school they usually teach you to round all 5's up to the next digit. For example, 1.45 is rounded to 1.5, 1.65 is rounded to 1.7, 3.225 is rounded to 3.23, etc.
This is wrong because it introduces what we call "systematic error": an error consistently wrong in one direction. In rounding all 5's up, you end up with an average that is too high. ("Random error" goes high or low of the true value randomly, so the average is close to the real value.)
The reason is that 5 is directly in the middle of the digits we round, so we must round it up half the time, and down half the time.
To make this more clear, look at the digits we round to another number: 1, 2, 3, 4 we round down. 6, 7, 8, 9 we round up. (0 we just truncate,...
The complaints against WyzAnt’s 40% commission demands a response.
Suppose a tutor with 15 hours of work time through WyzAnt charges $40 an hour. Of that amount, WyzAnt will automatically deduct $16. This deduction is based on WyzAnt’s commission rate, which is 40% for the first 20 hours of work time. So the tutor is not earning $40 an hour; rather, the tutor is earning $24 an hour. According to a number of individuals, WyzAnt’s 40% commission rate is too high, way above average. Some folks, oddly enough, have even posted complaints on other websites. Why?
Here's some food for thought.
1. Twenty-four dollars an hour is higher than any state’s hourly minimum wage.
2. You can create your website for tutors and charge a lower commission.
3. If you tutor for an hour you will be paid $24.
4. If you don’t tutor for an hour you will not be paid $24.
5. Twenty-four dollars is more than zero dollars.
6. You don’t have to stay with WyzAnt, but before you leave...
I value my time spent teaching, and your time spent learning. To facilitate the scheduling of lessons, I use the following cancellation policy:
Cancellation Policy for Students:
If a student wishes to cancel the lesson, she/he must provide notice at least 8 hours prior to the beginning of the lesson.
If a student cancels the lesson between 8 and 2 hours in advance, a cancellation fee of up to 35% of the lesson cost may be assessed.
If a student cancels the lesson less than 2 hours in advance (or does not show up to the lesson without prior notice) a cancellation fee of up to 50% of the lesson cost may be assessed.
If a student arrives to a lesson late, the lesson cost will include the time missed by the student.
If a student arrives to a lesson more than 20 minutes late, I may consider the lesson cancelled without prior notice.
Tutor Lesson Commitment:
I value my students time and education...
How many times have I heard this: "I'm too old to learn Spanish." Or, "Only kids' brains can absorb new languages." While I would like to just say "phooey!" and leave it at that, I've come to see that adults who say such things are in one of two groups: Traumatized Former Language Students, or Victims of Ageism.
There's a problem with language education in America: we don't do it. Why is it that the average person from any African national speaks four or five languages, with no language lab, little money at the local school, and no fancy computer apps? Because the people around them speak multiple languages: It's part of the culture. But also, sadly, it's because of a history of colonialism and the predominance of English in the world. French, Urdu, English, Patois. These folks switch between numerous linguistic codes with utter facility from an early age. It's a natural part of their culture. People in Africa (and Europe) expect multilingualism...
Well, okay, it's not incorrect, but it's flawed and by a mathematician's standards: morally wrong.
I'm sure at one point you boringly learned the order of operations. These are the set of rules that tell you whether you should do multiplication before division or addition before subtraction to get the correct answer on your math problem.
1) Parentheses (brackets)
2) Exponents x^x
3) Multiplication 2*2
4) Division 2/2
5) Addition 2+2
6) Subtraction 2-2
7) Get the right answer :)
Except, you don't always get the right answer.
For example: 8-2+1. Is it 5 because 8-3=5? Or is it 7 because 6+1=7?
Is 6/3/3 equal to 2/3 or 6/1?
The issue here is that focusing on the order of operations can lead to ambiguity and obscures the real beauty of mathematics.
A mathematician will tell you that 8-2+1 is actually 8+(-2)+1, which is unambiguously equal to...
I am a new tutor so a few days ago when l received a response to one of my first applications, l was very excited.
This "student" requested that we talk on phone to finalize the arrangements for date and time. I told him since l was home on spring break, he could call me on my land line but he wrote back requesting my cell telling him that when l am at home reception is very poor on my cell phone. He kept insisting on getting my cellphone instead, l was puzzled why. I never heard back from him. A day later l got an email from Wyzant that they had determined this not to be a true student inquiry. I have not figured out yet what this fake student was after. Can anyone tell me? Just be aware.
Please give notice at least six hours before the start time of a scheduled session if you have to cancel or reschedule for any reason.
If you cancel a scheduled session less than 6 hours in advance but at least 30 minutes before the start time, a fee of up to 50% of the cost of the lesson will be charged.
If you cancel a lesson later than 30 minutes before the scheduled start time, a fee of up to 100% of the cost of the lesson will be charged.
If you show up to a lesson late, the charge for the lesson will still be for the duration between the scheduled start time and the actual end time. If you are more than 30 minutes late to a session and have not communicated that you will arrive late, the lesson will be considered cancelled and a fee of up to 100% of the cost of the lesson will be charged.
When calculating a cancellation fee, a session duration of one hour will be assumed in all cases unless a different duration has been agreed upon beforehand.
I allow students to cancel lessons up to one hour in advance, with no additional charge. Cancellations with less than 60 minutes than the scheduled start time of the lesson will result in a full lesson charge. My cancellation policy applies to lessons that are pre-scheduled with unconfirmed details. For example, if we have a scheduled lesson, but I don't receive confirmed details regarding the new tutoring location's address, I will assess the cancellation fee.
The lesson will be charged from the agreed start time of the lesson, even if the student is late. If the tutor is late, the lesson will not be charged until tutoring begins. (However, it is very very unusual that I am ever late!)
I can't speak for every tutor, but I know that if you work with me I have certain expectations of you in order to ensure that you will see the greatest possible improvement in your score. Luckily, they are really quite simple, and adhering to them makes a huge difference. I've attached a PDF version to summarize my
Top 5 Test Prep Essentials that you can download, but I will review each of them below too.
For starters, I may be stating the obvious, but you absolutely must complete all homework assignments. All my assignments are tailored to your current performance and designed to help you achieve your goal score. Many students aspire to achieve dramatic improvements, and I fully believe such improvements are possible. BUT, in order to achieve such goals, it is imperative that you complete every homework assignment. If there is a notable gap between your current score and your goal score, that is perfectly ok, but it makes the homework that much more important...
I took the exam at Irvine Valley College.
Unlike most schools, whose administrators post classroom assignments on a billboard, IVC showed up around 8:15, had students stand in the quad, and verbally had students split into separate groups like cattle. Then students ended up having to walk down a confusing pathway to a classroom, where we had to have our IDs checked one-by-one. You can tell which schools have the check-in process down, and which schools need to work on it. IVC is definitely a school that can stand to be more efficient.
Once in the room, the proctor had difficulty with the test set-up process. She was unaware of the fact that there were now three components that come with the exam. It used to be that there was just a test booklet and an answer sheet. Now, with the revised exam, there is an essay booklet as well. I don’t think that she was supposed to hand out the essay booklet at the beginning of the administration, especially because...
The entrance exams for colleges are the toughest exams that students need to face. It is important to be with your child and help him or her prepare for it from an early stage. Read on to find out some ways in which you can make college admission easier for your child:
The deadline for college applications, process of applying, type of admission test and the minimum cutoff score should be found out. You can gather this vital information for your child and make it available to your child when required. It is important to ensure that your ward does not forget the scheduled test date and other requirements.
Encouraging the child to take the test a year early
It is a good idea to go for a trial run before the actual exam. You should persuade your child to take entrance exams in the junior year itself to get an idea about the question pattern and requirement of time management. This can ensure that when the actual time for admission comes,...
Thus far, all students that I have tutored for Regents and SAT exams (algebra, geometry, trigonometry) have passed their exams. Some students passed with distinction. Some students passed after failing their exams (sometimes twice) before my tutoring. I am also available for tutoring calculus, differential equations, numerical methods and other courses in mechanical engineering and applied math. I am certified in 44 subjects.
I usually tutor adults at a public library near where they live. I shall tutor at a person's home if it is appropriate, and will not create wrong impressions.
I shall tutor a minor (male or female) only at the student's home, with a parent or guardian present. If a parent or a responsible adult (family member) is not present, the tutoring session will be postponed or canceled. I shall tutor a minor at a public library, provided that the student is accompanied by a parent.
Because of occasional errors with the profile page, this is the most accurate listing of my availability for Spring 2018.
It's that day and time. It's time to get up in front a group and deliver your scheduled speech. (Hopefully you've organized your main points and documentation - worked on the presentation and practiced your delivery - before now.)
Who are the people listening – or not listening – to you? Why are they there?
Audience analysis involves identifying the audience and adapting your presentation to them. This doesn’t mean “saying what they want to hear.” Audience adaptation should guide your content development and approaches to delivery.
Audiences can include reluctant attendees, indifferent visitors, agreeable supporters, and angry or fearful dissidents.
The “we have to be there” mindset.
For instance, I would contend that students in a public speaking class – and their motivation to listen to you – is somewhat mixed. (Hey, they’ve “got” to be there regularly, right? We refer to this as a “captive” audience.) In my experience, here are some of the...
Wyzant has a policy to allow new students to meet with a tutor of their choice and if they don't find the tutor meets their needs, they may contact another tutor without charge (as I understand it). This is a customer-friendly policy that makes students feel more comfortable in contacting a potential tutor. However, it works both ways. A tutor will also need to review the information a potential student provides to determine if possible how well the tutor can provide the help requested. The problem lies when the student gives no information.
When a student writes only "I need help", or "when can you meet", or writes no message at all, it is impossible for a tutor to determine if he/she can help. A tutor must determine the student's specific subject and area of need, level, school or work situation, possible schedule (e.g. evenings only), and other factors to see if he/she can help. It becomes a waste of time to write back and forth when the student...
For those of you who may have purchased Apple's spiffy $79 external CD/DVD burner (or Superdrive as they call it), it may not have worked when you plugged it into your older Mac. A lot of times a person's built-in optical drive fails, and they see the new external at the Apple Store. They naturally grab one assuming it'll work because they'll be using it with a Mac. Hopefully there's a "Genius" selling it to them who's going to ask which Mac they plan on using it with. I'd think probably not. It turns out it's only the fairly newer Macs that support it.
When you plug it in, your older Mac might very well inform you that "This Apple External CD/DVD drive is not compatible with this Mac. Please go to Apple Support to read more." What they show you is a compatibility matrix that seems to makes no sense. I haven't compared every spec of every Mac they list, but 2009 seems to be the general cutoff.
Perhaps Apple requires USB 3, and...
I've been creating mad-libs to use with my middle school French students. If anyone else would like to use them, feel free. Many of them are created from non-copyrighted short stories, not my original writing.
Mad Lib 1
1. un mois
2. un profession
3. un lieu
4. une Fete
5. une chose
6. un verb avec ils
7. un prenom d'une femme
8. un verb avec elle
9. une chose pluriel
10. un verb avec elle
Nous sommes en __________(1). Gilles est ________(2) dans un/une ________. C’est bientôt la __________ (4) et Gilles a acheté un nouvel ________ (5).
« ____________ (4) est un lundi cette année », dit le _________ (2) à sa femme. Ensemble, ils _________ (6).
La femme de Gilles s’appelle ________(7). Elle _________ (8) dans un magasin de décorations en ville. Durant le mois d’octobre, elle a souvent beaucoup de _______. L’automne est une période où _______(7) ________ (10) beaucoup.
From late evening on August 12th to early morning on August 13th, you will have the opportunity to attend one of the greatest shows on Earth. Well, not exactly on Earth, per se, but up in the mesosphere. Some 30-50 miles above your heads, debris cast off from comet Swift-Tuttle will enter the atmosphere, pass through the very sparse thermosphere, and collide with gas particles in the relatively denser mesosphere. Fragments of rock and dust will leave their bright tracks for an instant on the night sky.
Details- Doors open when the moon sets, around 9pm (best viewing after midnight), no cover charge, all ages welcome. Look northeast, around the constellation Perseus.
Happy Perseids Meteor Shower!
NOTE: For today's Math Journey, please refer to the image file “Image for Math Journey: Road Trip Around A Problem” under my WyzAnt files. Link: https://www.wyzant.com/resources/files/671706/image_for_math_journey_road_trip_around_a_problem
Let's go on a road trip!
When I teach geometry, especially geometry involving angle measures like this problem, I like to describe the process of solving a problem as taking a little road trip. I describe it this way because this is how I personally feel when solving a problem like this – my eyes rove around the figure from one intersection to the next, and I hop in my little math car and drive along lines and stop at intersections to figure out where I am. Geometry is a very visual discipline, and as a visual learner, I have the most fun when I can trace a physical journey around the problem, solving things as I go. So let's hop in our math car and chase this problem down!
The first step in any problem like...
Infinity is a term with which most people are familiar, but few truly understand. Infinity is not an actual value, like the number 3 -- it is an abstract concept. In math terms, it is used as a "limit", where a value can approach infinity by getting continuously larger, but it will never actually get there. Consider the act of cutting a pizza into slices. You can cut it in half, then cut those halves in half, then cut those halves in half, etc. As the slices get smaller, the number of slices gets larger; therefore, as the size of each slice approaches zero, the number of slices approaches infinity. Again, in math terms, this means that as x approaches zero, the value of 1/x approaches infinity. Some go so far as to say that 1/0 equals infinity, but this would not be entirely correct; nothing can actually "equal" infinity, since it isn't a value, but an abstract limit that can only be "approached".
Here's another example. You are standing a...