Standard Deviation of a Frequency Distribution

[@chalapeno]

I'm glad someone had the willingness to sit down and explain the way it needed to be explained. Great video, I'm never going to forget how to actually make this calculation!

[@crowsmathclass]

You’re welcome. Glad it helped.

[@asantemaxblair]

Here in Africa we following you, especially in country of Rwanda , we get many point on this course

[@cocobubble2017]

You helped me more than my professor, thank you

[@crowsmathclass]

You’re welcome. Glad it helped.

[@12tribesalpha]

Ty

[@karengonzalez2219]

THANK YOU! The formula was really difficult for me to understand until you simplified it !

[@crowsmathclass]

You’re welcome. Glad it helped. Thank you for the comment.

[@wami5929]

I almost cried when i got the assignment looking for standart deviation BUT FINALLY I FOUND THIS HELPFULL VIDEO and finally i can do my assignment huhuuu thanks for making this video, love u to the sky and back

[@crowsmathclass]

You’re welcome. Glad it helped.

[@christinegarcia2846]

Thank you! You help me understand what my professor could not accomplish! You are truly an asset. Keep making your video's. I wish you were my professor.

[@crowsmathclass]

Thank you for the comment. Glad the video helped.

[@S1RVALENTINO]

I was so stuck on a problem and this helped me slow down and rethink a TON, thank you

[@crowsmathclass]

You’re welcome. Glad it helped.

[@Memes-oe2si]

Thank you I was having a hard time but now I feel confident in my class your awesome :)

[@rabbits_gaming]

Thank you so much for explaining this in English. Much more help than my professor and textbook.

[@crowsmathclass]

You’re welcome. Glad it.

[@IQ-Vortex]

Better explained than my professor. Good on you sir!

[@crowsmathclass]

Thank you. Glad it helped.

[@blahblah5446]

You helped me a lot.Thank you!Hope that you and your family will have a prosperous year.

[@crowsmathclass]

Thank you. Glad it helped.

[@Vladiator01]

Thank you straight to the point. My professor teaching style is all over the place hard to follow

[@crowsmathclass]

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[@acer1748]

You’ve saved my life. Thank you!

[@crowsmathclass]

Glad it helped

[@bobbietaylor7341]

Thank you so much for your explanation. It was a huge help for my son.

[@crowsmathclass]

You’re welcome. Glad it helped.

[@tamannatania1122]

Thanks a bunch sir.the way of your teaching is very easy. 😇

[@crowsmathclass]

You’re welcome. Glad it helped.

[@20wolverines2013]

Having to teach myself the class, this was very helpful. Even the textbook wasnt helpful.

[@crowsmathclass]

Glad it helped. Check out my website where I have all the statistics videos organized. sites.google.com/site/crowsmathclass/statistics-videos

[@thekings6128]

Thank you very much❤❤ You are more than my teacher🤵

[@crowsmathclass]

Thank you. Glad the video helped.

[@jadensawyer6376]

You explained this so well! Thank you so much!

[@crowsmathclass]

Thank you for the comment. Glad it helped.

[@majlirodriguez1810]

I like how you broke it down, thanks for the help!

[@crowsmathclass]

You’re welcome. Glad it helped. Thank you for the comment.

[@melissaondongo5736]

Thanks a lot , I was getting confused with the sum of F . Now it’s all clear . Thanks a lot I think I’m really for my test. 👏👏👏👍👍👍👍👍

[@crowsmathclass]

You’re welcome. Glad it helped. Good luck on your test.

[@Cowpunch]

oh great 6 year old KZbin video I give my thanks to thee.

[@crowsmathclass]

You’re welcome.

[@jasonvoorhees7239]

Thanks Dr Eugene Porter

[@dianamay6115]

Thank you! Saved me from stress

[@crowsmathclass]

You’re welcome. Glad it helped.

[@zigapinteric2197]

Thank you man... The formula i was looking at was shite... bless you man!

[@crowsmathclass]

Thank you.

[@nyawirawaithaka4993]

Thank you so much! You are a life saver!

[@vahlahri]

Thank you!! You explained it so well

[@crowsmathclass]

Thank you. Glad it helped.

[@multanitigers9816]

Thnks professor from Pakistan❤️👍

[@crowsmathclass]

You’re welcome. Glad it helped.

[@shanefromoutin9619]

So clear bro thanks for the help

[@crowsmathclass]

Thank you. Glad it helped.

[@rachelcorelle9485]

Thank you so much for posting this video, it was so helpful!

[@crowsmathclass]

You’re welcome. Glad it helped.

[@brennawelsh2288]

thank you so so much!! so helpful!!

[@crowsmathclass]

You’re welcome.

[@thelmaschannel9830]

Thank you for sharing us your video. It helps a lot!

[@crowsmathclass]

O'leary 71 Glad it helps.

[@shyannflagg6076]

THANKKKK YOUUUUUU! You saved my life

[@crowsmathclass]

You’re welcome. Glad it helped.

[@auroradiaz8327]

You saved my life!!!

[@crowsmathclass]

Glad it helped.

[@daniela5447]

THANK YOU IM GOING TO CRY I FINALLY UNDERSTAND

[@crowsmathclass]

Glad the video helped.

[@MaryKay1994]

why did you round to .3 on the last two x squared instead of leaving at .25?

[@crowsmathclass]

No particular reason. You could do it either way.

[@michellephillips5827]

This was very helpful, thanks!!!

[@madmarie6318]

This is so helpful! Thank you!

[@crowsmathclass]

You’re welcome. Glad it helped.

[@JessicaHernandez-je7qn]

I don’t get the very last part how did you get the standard deviation am I missing something because I did all the math correctly??

[@mikasaackerman7085]

Thank you so much for this! I just have a question. Can the same computation formula be used in population standard deviation of a freq distribution?

[@crowsmathclass]

You’re welcome. The formulas are a little different.

[@lindaseem580]

Thank you for this helpful video!

[@crowsmathclass]

Glad it helped.

[@reemakhalid4558]

this is very helpful thank you so much

[@crowsmathclass]

Glad it helped.

[@atpole818]

Liked and subscribed. Thanks for the help

[@crowsmathclass]

Thanks. Glad the video helped.

[@TaylorSmith-p7f]

Wihat is the broken down formula for population of a distribution table? I couldnt figure out if I should still add an extra n on the bottom if it isn't going to be n-1

[@chalapeno]

I'm just a student and @crowsmathclass would need to confirm this but I think the denominator would be x*x. as in n(sum(fx²)-sum(fx)²)/n² . Word of caution, I think you need to have the full actual dataset on hand to make a 𝜎² computation.

[@hlengiwengutha7844]

Help please. A retailer observes that the demand for a popular board game averages 40 per week with the standard deviation of 13. If the seller wishes to have adequate stock 99% of the time, at least how many games must she keep on hand?

[@yusufbodamjonathan9874]

Thanks so much!

[@crowsmathclass]

You’re welcome.

[@nontandoyenkosimokoena8061]

Thank you ❤

[@crowsmathclass]

You’re welcome.

[@xEpTICSHOTZz]

this was awesome

[@crowsmathclass]

Thank you. Glad the video helped.

[@haivalentine]

i love you. thank you.

[@crowsmathclass]

You’re welcome.

[@tonyomoto756]

This is the perfect lesson I have ever seen :D I just want additional knowledge if you know sir. What is the difference between standard deviation with sigma symbol ( σ ) and standard deviation with letter symbol ( s ) ? Please let me know, because my calculator is showing σ and s value for standard deviation :(

[@crowsmathclass]

sigma represents the population standard deviation and s represents the sample standard deviation. Glad the video helped.

[@tonyomoto756]

wow..thanks a lot Sir, you are a great teacher! My smiles are from ear to ear knowing this :D Now I can do statistics by calculator and by hand :D

[@12tribesalpha]

Is frequency term used interchangeably of N? If not, is how do I find n(n-1)?

[@crowsmathclass]

Typically n equals the frequency.

[@somethingaboutstatistics5537]

Why standard deviation ia not calculated by Geomtric mean while Geometric mean is also an average. Kindly explain??

[@rohanbony541]

is that formula correct what i found from other sources is that he is using extra 'n' in both numerator and denominator which cannot be cancelled ,then that formulae must be wrong...

[@crowsmathclass]

The formula is correct. I once looked in three different books and there were three different formulas. They are all correct. Notice the second term in the numerator in my formula is not divided by n. If it is in your formula, then you can multiply each term in the numerator and denominator by n and that will give you the formula I am using. Hope this helps.

[@TheCarebearstar]

Good vid

[@crowsmathclass]

Thank you.

[@tomassedlacik7236]

helpful, if you need to recall it, thanks

[@crowsmathclass]

You’re welcome. Glad it helped.

[@JohnMiranda-d5h]

on 4:11 how did you get 119.5 squared and reach 14280.3 instead of it being a 14280.25?

[@crowsmathclass]

Probably rounded.

[@johnny343-f1d]

I see that but doesn’t that cause issues with finding a precise answer Asking because my online hw needs one Thank you for the teaching the method!

[@crowsmathclass]

@@johnny343-f1d Yes. For online homework I wouldn’t round.

[@donnewagush3248]

thanks a lot

[@crowsmathclass]

You're welcome. Glad it helped.

[@salmadavila352]

life saver

[@crowsmathclass]

Glad it helped.

[@12tribesalpha]

How do you find frequency?

[@crowsmathclass]

You will either be given the frequency or given data so you can count how many values are in each interval.

[@Itsriastylez]

fr thank you

[@crowsmathclass]

You’re welcome.

[@samosorno7585]

LIFE SAVER!!

[@crowsmathclass]

Glad it helped.

[@asantemaxblair]

Thank you

[@crowsmathclass]

You are welcome. Glad it helped.

[@princegarcia9034]

Wow

[@HeatingUp1000]

78x78-1=6083

[@TheTylerDeanchannel]

Its n(n-1) not n x n -1 meaning 78 x 77 = 6006

[@justrandomstuff7354]

(78-1=77) 78*77=6006

[@amithfernandes8037]

D

[@sechabachalale7520]

and i'll tell you what i'll do 8:21

[@liamkirkpatrick3073]

Thanks so much!!

[@crowsmathclass]

You’re welcome.