Standard Deviation in a Nutshell - 170 GRE Quant

Standard Deviation simply calculates how spread out, on average, numbers are away from the mean.
Don’t worry too much about the fancy formula. The GRE virtually never tests it, in my experience. I have done one example at the end of video anyway, just in case, to show how to calculate standard deviation.
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: [e-mail]
First secret: Standard Deviation has nothing to do with the median!
Next secret: The Range is only Relevant if the range is zero. Otherwise you cannot use the range to calculate the standard deviation of a set of numbers.
So how is standard deviation actually tested on the GRE then?
Here is a classic question:
Six hundred applicants for several post office jobs were rated on a scale from 1 to 50 points. The ratings had a mean of 32.5 points and a standard deviation of 7.1 points. How many standard deviations above or below the mean is a rating of 48 points?
What does ‘Within 2 standard deviations’ mean? It means within 2 standard deviations above OR below the mean. We will show this, using a bell curve.
Finally, we will calculate an actual standard deviation quantity on a small set of numbers:
4, 5, 7, 11, 13
This will not only be helpful for calculating standard deviation on the GRE, but also for gaining some statistics GRE practice. These standard deviation questions should help illustrate ways to get a GRE 170 Quant score.
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: [e-mail] 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 [e-mail] with the subject line, “PHILIP SENT ME.”

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[@TheTestedTutor]

Haha thanks Soham

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[@TheTestedTutor]

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Holy crap finally I understand this concept! Thank you so much!

[@TheTestedTutor]

So great to hear Anna! Anything else you are stuck on?

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Thankyou so much sir for amazing videos.

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[@TheTestedTutor]

That's so great to read, thank you Geethanjali G

[@brooke_ibarra]

I was always that student who was intimidated for SD questions, this was so simple and easy to understand I'm almost embarrassed that I was intimidated of these types of questions before. Goes to show you are a great teacher, thanks again for an informative video. I'm now 20 days away from my GRE

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I took my GRE today and wanted to thank you so much for all of your help. I watched your whole channel in order to prepare! Every video contained so many fantastic tricks and bits of wisdom. One heads up: I was actually asked to calculate standard deviation on the quant section. Not sure if it was the research section or not...but could be worth noting in a future video.

[@TheTestedTutor]

Thann you so much Naomi, noted!

[@cardiyansane1414]

i cant believe its so simple ...this whole time I have been skipping them , thankyou thankyou!

[@TheTestedTutor]

No worries

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We watch your video regularly..
Love from Bangladeshil#

[@TheTestedTutor]

Thank you Mizanur! Please do tell your friends, and get them to comment too!

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[@TheTestedTutor]

No problem Gomz!

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[@TheTestedTutor]

Thanks Grayon!

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[@TheTestedTutor]

Thank you Shealyn and good luck for Friday

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My GRE is in a little over a week, and I've been really worried about standard deviation. Thank you so much for the video!!!

[@TheTestedTutor]

Hope it went well Olivia

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@@TheTestedTutor I got the score I needed, thank you! I encountered a few complications before entering in the exam, but it all went well in the end. I really wish I found your channel sooner!

[@TheTestedTutor]

@@olivianguyen4157 Thank you so much for letting us know and well done! :)

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Thank you for your videos. I could score 168 in Quant and 155 Verbal.

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I've been going through the official ETS Quantitative guide and didn't fully understand their explanation of this example. Your video was so helpful for me! Thank you for this!!!

[@TheTestedTutor]

Thanks for commenting Marissa :)

[@akash-dsouza]

This is so much easier than what i expected standard deviations to be. Thanks!

[@TheTestedTutor]

Great to hear Akash

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Thanks for making it sound so simple. Please make another video on solving more Statistics questions for GRE - medium to hard level.

[@TheTestedTutor]

Will do Soumya! Thank you for the great suggestion.

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Excellent explanation

[@TheTestedTutor]

Thanks so much Giselle

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[@TheTestedTutor]

:)

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[@TheTestedTutor]

Thanks for the comment Tifa

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I wish I had a teacher like you while growing up. Probably Wouldn't have hated maths😂

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Not me watching this 30 minutes before taking the GRE. Thanks for the help!

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[@TheTestedTutor]

Thanks so much Sabina

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[@TheTestedTutor]

Wow, thank you Yuwari!

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I was so confused with SD. Now it's all so clear. Thanks!

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[@TheTestedTutor]

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Studying for the GRE and found this helpful. Thank you!

[@TheTestedTutor]

Thanks Michael!

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[@TheTestedTutor]

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[@TheTestedTutor]

Thanks Ummer!

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I'm always elated to watch your videos, Because i know you would explain the concepts so well. Thank you so much for this video, it's just perfect.

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Thanks for this simple and easy to understand explanation of standard deviation. This really was stressing me out before your video! :)

[@TheTestedTutor]

Thanks man

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excellent explanation sir..

[@TheTestedTutor]

Thanks Shakil!

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[@TheTestedTutor]

Thank you Vatsla for such a kind comment :)

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Same I am also going to take

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[@TheTestedTutor]

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[@TheTestedTutor]

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[@TheTestedTutor]

Thanks Yashovardhan!

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[@TheTestedTutor]

Thanks Satyam! No need for shame though!

[@tosinghsatyam]

@@TheTestedTutor Thanks for the kind words.
have a look at this video ( czcams.com/video/5eEqm1WKISs/video.html ). it has got some good points for standard deviation. I think you could include some points from this in your up-coming video or maybe add it at the end of this video (if that's possible).

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loved this whole series, really helpful

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Thanks much . Wish i started earlier got my test coming on 21 march

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This video's content is well above 2 Standard Deviations

[@TheTestedTutor]

Haha thanks Nathaniel!

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[@TheTestedTutor]

:))

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Amazing explanation! I was literally struggling to understand SD and its exact meaning and usage and then I came across your video! Thank you so much! I cant wait to check out your other videos as they might be useful as well. Keep up the great work! :D

[@TheTestedTutor]

Thank you Shiksha! I have lots of them so looking forward to your feeeback

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[@TheTestedTutor]

My pleasure!

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I can't believe I finally understood this! Thanks a lot :)

[@TheTestedTutor]

So glad Ash!

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[@TheTestedTutor]

Maybe one day!

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Thanks Pearl

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Could you please make a video on complex sums from rectangle, square, parallelogram, triangle etc.?

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Probably I'll fall in love with you someday! 😅

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I will try my best, but who is phelps?

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Thank you Theresa

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Very clear explanation of the SD. Thanks a lot!

[@TheTestedTutor]

You are welcome Gautam!

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[@TheTestedTutor]

Aw thank you watermelon 🍉

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Really helped, some mins into it, I was clear with the concepts.Thank you. Hoping for more such videos.

[@TheTestedTutor]

Thanks Apoorva! I just made another Quant video, should be up in 20 minutes... :)

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Thank you Phillip.
would be looking forward for more secret strategies to crack Gre.

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Finally ...understood it clearly..u r doing a very good job ..cheers..

[@TheTestedTutor]

Thanks Praga

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@@TheTestedTutor could you pls explain the sum number 5 pg.166 of the official guide...plss..thank you in advance

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Thank you so much for this analysis and sample sentences.

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A very simpler and cogent approach.. thanks 😁

[@TheTestedTutor]

Thank you kindly Arth!

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The Standard Deviation questions were scarely until I watched this video. Now they don't stand a chance.

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[@TheTestedTutor]

Thanks Siddhant!

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[@TheTestedTutor]

You're welcome sofia!

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I finally understand this. Thank you!

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Everything in the video is perfect, and you can deliver the concept straight forward. Greetings :)))))

[@TheTestedTutor]

Thanks Mohammed!

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Love from India!

[@TheTestedTutor]

Thank you! Will do!

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Amazing chief 🔥