Normal Distribution in a Nutshell - 170 GRE Mathematics
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- Опубліковано 27 вер 2024
- Normal Distribution applies to heights, weights, IQs, and much else, but how can you be tested on it? This video will cover the key phrase ‘normally distributed’ and why you should look out for it.
I offer private GRE / GMAT tutoring online at a fixed rate of $140/hr. Please get in touch via the email below, or through my tutoring website: www.gretutorlo...
Enquiries: philip@gretutorlondon.com
We must remember the 3 key percentages: 2%, 14% and 34% and how they are laid out on a bell curve.
From these, we can calculate that 68% of people lie within one standard deviation of the mean and 96% (or just a bit closer to 95%) lie within 2 standard deviations of the mean.
Do check out my other video on standard deviations if you want to learn more, but for this ‘normal distribution in a nutshell’ video, we can just leave it as a standardised measurement of spread.
Our two questions will be of medium and hard difficulty:
Q1. In a set of student exam results the 30th percentile corresponded to a score of 16 and the 40th percentile corresponded to a score of 27.
Quantity A
The 50th percentile score
Quantity B
38
Q2. The heights of a group of math teachers are normally distributed around the mean. If the median height is 175cm and the 84th percentile corresponds to a height of 181cm. Which of the following heights correspond to the 2nd percentile?
A) 161cm
B) 163cm
C) 165cm
D) 167cm
E) 168cm
I offer private GRE / GMAT tutoring online at a fixed rate of $140/hr. Please get in touch via the email below, or through my tutoring website: www.gretutorlo...
Enquiries: philip@gretutorlondon.com If you’re now ready to get into your dream MBA program, my former student, Angel, is offering virtual private Admissions coaching. She was admitted into Harvard Business School, The Wharton School of Business, and Columbia Business School (accepted into every school she interviewed for) after graduating from UCLA with a degree in Communication. She also got 3 perfect scores on the GRE’s Analytical Writing Assessment (99th percentile).
Here is her link - linktr.ee/ange... - and you can reach her at angellinzhu@gmail.com with the subject line, “PHILIP SENT ME.”
![Quartiles, Percentiles, Quintiles, Interquartile Range, Box Plots [worked examples! Oh wow]](http://i.ytimg.com/vi/fhFDjxcOrb8/mqdefault.jpg)
You deserve an award for the Best Tutor of the Decade. I am taking the test the second time and your videos have been a life saver. I find it better than other GRE materials.
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OK, will try! Thank you for the support Shiyanbola.
you should probably get a Teacher of the Decade Award!!! your voice and the way you explain things is so out of the world!
Watching this one night before the GRE. Thanks for clarifying the only topic I had left behind, in 11 minutes :)
Excellent! How was it?
@@TheTestedTutor I got a 323, and thanks to you I could solve two direct questions from normal distribution within seconds :)
It's you who robbed me of my fear in math! So grateful for your videos, the one resource I know I can trust. :)
I'll be taking my GRE in 4 days. I have been watching your videos for the past month or so. Your effort is much appreciated, you're a great teacher. I'll continue to support your channels.
That was a 170 level GRE question :O ? really? I was able to find the answer under 15 seconds. You're a great teacher!!
Your way of teaching is best......Thank you very much for making us understand this difficult topic
Thank you for the wonderful videos. I wish I had watched these videos before I attempted for GRE...
Dear Tutor, I understand concepts well but when I appeared in GRE, specially, in the second section of quant, I could not do well. And my timing problem I think also is a fact, but I struggled to understand the strategy of some questions to solve..and also for verbal, it was bad..If you have suggestions for when doing good in the first section of quant, how to do good in the second harder section, please share your suggestions... thank you
Your videos are most helpful , specially on those days when I am tired after day's work and don't wanna open books to study or practice. You are awesome.
Dude this is epic! I needed exactly this kind of revision before my GRE exam next week.
Thanks Akshat
How much did u score?
@@vaibhavvalandikar3913 309. i messed up in verbal. I will give it again in the next few weeks
@@akshatw7866
Not bad though, All the best!
@@akshatw7866 Hey
Can u tell me ur strategy for Verbal?
How did you study for it?
I solve questions from practice sets and write down all the topics where I got the answers wrong. And at the end of the day, I watch your videos on those topics. All my doubts cleared! 😁
Thank you!
Watching this one currently and got a notification that you liked my comment. Again thank you for your hard work. I am honestly not good at math, but your simple explanations give me hope.
Thanks for uploading such a useful video...I hope you keep uploading more often than not.
Thanks shobhit
Thank you for demystifying the concept.
Giving GRE in 2 months and learning from your videos... Thank you so much ! Your tricks are really helpful in understanding as well as solving !
Your explanations are so apt. Made the seemingly hard question so easy to crack. Thank you, Philip!
This was insane buddy!
I understood everything you said. Thank you so much
Hey Phillip. This is by far the 3rd video I have seen. You are the best at elucidating the GRE concepts!!! But your videos are limited. Try to make more such videos. A true perfectionist. 💯
I have made many new ones! Lot of hard work ...
thank you so much for this video! you're the best! every time i get stuck on a topic, my solution is to open your youtube channel!!!
The best tutor I have ever studied from!! Thank you sir!! ❤❤
Wow, thanks vaibhav!
Really enjoying your videos and mustsay that the first thing I do when I open UA-cam is to check your channel for new GRE videos. Hope I can implement these techniques on my upcoming GRE. Thanks a lot!! Make more videos like these.
Thanks so much ab
From what I understood, all your maths videos are normally distributed in the time variation😊. I can't stop studying all your unbelievable tips
Yes probably a mean of 18 mins and a SD of 6 mins. But then again I have hour-long videos so not very normally distributed unfortunately
I came across your channel an hour ago and this is the first video of yours that I'm watching. Thank you so much! I'm so glad you've made it so easy to understand these concepts. I'll be taking the GRE in another 20 days and I'm really freaking out. I keep making silly mistakes and get really really anxious when I look at the time while taking mock tests. I'll be going through the remaining of your videos. Thank you so much!
Thanks Ananya! Let me know how you find everything
how was your test ?
can you tell the essay topic?
Saw so many videos but only you made sense
Thanks Rafi
I can't thank you enough! I might have studied math more diligently if you were my tutor.
You truly demystified the concept.
Thanks
I am heading to my second try and already your videos make a difference ❤❤
Thanks a lot, sir! Keep making more such videos. You are quite famous among Indian students.
M short of words to comment for ur videos...
amazing amazing 🙌🏽
Is this concept of normal distribution enough for gre?
@@dipthyanchan6510 Yep! :)
Studied normal distribution in my engineering, a great refresher for GRE.
You are so incredible.. Thank you.
wonderfully explained..!!
Great lecture dude! How your channel isn't subscribed by more people is beyond me.
Beyond me too :)
great explanation, thanks a lot
A humble request, please make some more videos on RC, thank you.
Another awesome video... this is easily one of my favorite UA-cam channels!
Thanks so much...you just saved me so much time
You are an incredibly good teacher!❤
First of all this was a truly helpful video and thanks. I don't want to seem like a braggart but I got that 170 Q question correct and still I am struggling with some other questions, and I think that the hardest normal distribution questions are the ones that try to trick you with pure concepts such as the 'indicate all such statement' questions, and not the ones which require you to calculate an answer.
Your lucid explanations are amazing! Love and respect.
Glad you like them Simar!
Was eagerly waiting for your new video. Maybe it's too much to ask, but please try to post more often!
Thank Tanjim! I will try! With more comments like this I will...
Thank you tested tutor.I am learning alot
I take down notes
Please can you do a video on questions to expect in coordinate geometry
Great idea Mayowa
fantastic video. Thanks a lot
amazing, thank you!!!
Thanks a lot man!
Simply superb 🙏
Amazing content. I had given up on this topic but now I feel I can do it with a little more practice.
I understood the conceptvery thoroughly Philip! Cheers mate! Keep up the good work! Blessed to have a tutor like you 😁🤗
Thanks! 😃
one of the best tutors out there! Thank you so much for these videos!
U just nailed it!
That's such a great explanation sir,
was struggling with the concept. Your
video made it so simple
Glad to hear that
The second question wasn’t even very difficult AFTER everything in your video leading up to it. Thanks again for everything Phillip!
What an incredible job you are doing sir... Really appreciated.
Thanks
Thanks and welcome
You and gregMatt are amazing
Great lesson. You have yourself a new subscriber
Helping tackle the scary questions in a simple manner, really helpful videos
Omg, does it count that I was so close to the answer? I figured out the first two steps and did something else from that point. This was really enlightening, though. Thank you so much.
Well done Stephanie, it does count!
This is great! thank you
Thank you, so much for these amazing videos, they are really helpful. I wish to score a perfect 170 in Quant.
This video really helped me, thanks a million 👌🏻👍🏻
This is awe-inspiring
Thank you❤
Thanks so much for all your videos! They have been amazingly helpful and inspiring! I love your optimism in the way you teach.
Means a lot Catherine
Yes! I have made the correct answer. Thank you for your Video.
You are welcome!
Thank you so much helped a lot!!!
Thankyou sir.
Wow. Made it look so simple. Thanks a ton!
Glad it helped!
Thanks a lot for such a easy explanation, you're great !! I'll suggest this channel to my friends
Awesome, thank you!
Wow this was so clear. Thanks Philip it really helped me and now I could do the problems with ease!
Great to hear eshwar!
Your videos are great for GRE!
Very helpful thank you
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i feel lucky to find your channel
Thank you Asif!
@@TheTestedTutor hey would you please make a video about mock test? Like how many mocktest we should give or, from where, and how to log my error etc.it would be beneficial for us
THANKSSSS
I think u should branch out to other examinations to increase channel growth cause your content is awesome 👍
Thanks a Bunch! The 5lb book surprised me with this topic, but your explanation covered a lot of what I needed to know.
Though I am not aiming perfect score, still it's clearly comprehensible to me due to your beautiful explanation. Best wishes.
Thank you, your videos are really very very helpful
Glad to hear that Akash!
Thanks, it was really helpful
Mind-bl0wing tricks!
yep, i am that person sitting here embarrassed that I fell into the trap. you called it.
thanks for such easy explanation
Thank you Shubam!
😊 glad that you replied
Omfffg this man is a genius 🥵
give more energy and resources in this channel, you can start paid services too!!
Hi, Can u plz do one video on Coordinate Geometry ? I really suck in that and anything I read on that topic goes above the top of my head.
EDIT : My exam is next month so it would be really helpful if you upload video before that.
OK!
Thank you! Thats been a lot help!
Thank you very much 💯
Thanks Yogesh!
Peace on earth, and mercy mild! O thank you thank you
Hi Philip, I'm a big fan of your videos - love the simple and thorough explanations you've provided for a myriad of topics :)
I've been watching your videos for a few weeks now and I managed to get a perfect score in quant in my last two mocks. I'm planning to take the GRE in 8 days from today. Just wanted to check - is there a video or a couple of videos where you've summarised all the important concepts and formulas that a test taker should review in the last couple of days before the test? If not, any chance you can make one?!
Eagerly waiting for your answer!
P.S. I will write a thorough review for your wonderful videos once done with the test (irrespective of the result).
Thank you!
Hey, I haven't summarised everything, there is a bit too much. But a perfect score is insane, well done. My advice would be to focus on not making small mistakes and being rested rather than hunting down any super obscure topics though...
Thanks a ton for your prompt reply and amazing videos, Philip!
I took the test last week and unfortunately scored a 167 in Quant, despite scoring 170 in both the Power prep tests.
I was really hoping for a 170 so a bit disappointed there. I think I got put off by the experimental quant section, which was quite difficult. I usually finish and revise all or most of the questions within time but this time I couldn't even complete the experimental section in time (I'm guessing it was the experimental section because it went pretty bad and even a 167 wouldn't be possible if it had been scored). That affected my performance in the actual quant section and I somehow barely managed to finish the last quant section. Could you guide me on how I can best prepare for a perfect 170 in another attempt about 3 weeks from now? I had done the OG and OG Quant and Manhattan 5lb this time. But I don't know how accurately they represent the difficulty of the second quant section. Should I revise them all again or is there another resource that I could leverage for the higher level questions? I don't have the detailed report yet.
Also, I scored a V161, roughly in line with my mocks. My weaknesses are spread across the topics haha, so any advice on how I can possible increase my score by a few points in the next few weeks? I had done the OG, the OG Verbal Reasoning, and about half the RCs in the big book.
Sorry for the long message - I am really hoping to score in the 335 range so I can try to get a good scholarship. Thank you so much in advance!!
- A big fan of all your concepts, tricks and advice :)
Tremendous video explanation rather than any paid service for GRE....
thank you : )
Hello tested tutor u are doing a great job. I have a doubt in the last question when the S.D is 6 so are not be taking both sides like the one towards right and one toward left? If not why? If we will be taking both then we need to substrate by 24 is not it? Please clear this doubt.
Thanks
Thanks a tonne! you are doing an amazing job Sir! looking forward to more of your videos :)
So nice of you
Can you please do the tricks or suggestions for finding probability from mean and standard deviation?
Did you check out my SD vid?
Can you please do a video on box and whisker plot ? Thanks in advance
Thanks!
:)
Hi, I have been following your videos regularly, and thank you very much for the detailed explanation and tricks. They are very helpful.
HI, that was a very informative video o Normal distribution. In q1 it is not mentioned as normal distribution so we cannot determine the answer. What is the answer if the distribution in Q1 is normal? I still believe the answer is D, because even though the distribution is normal, we have no SD and there is no way of telling if 50% is greater or less than 38. Please, correct me, if I am wrong.