Standard Deviation of a Frequency Distribution

This video shows how to find the standard deviation of a frequency distribution.

[@cocobubble2017]

You helped me more than my professor, thank you

[@crowsmathclass]

You’re welcome. Glad it helped.

[@12tribesalpha]

Ty

[@Memes-oe2si]

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

[@asantisibomana3]

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

[@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.

[@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.

[@acer1748]

You’ve saved my life. Thank you!

[@crowsmathclass]

Glad it helped

[@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.

[@nyawirawaithaka4993]

Thank you so much! You are a life saver!

[@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.

[@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.

[@jadensawyer6376]

You explained this so well! Thank you so much!

[@crowsmathclass]

Thank you for the comment. 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.

[@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.

[@michellephillips5827]

This was very helpful, thanks!!!

[@thelmaschannel9830]

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

[@crowsmathclass]

O'leary 71 Glad it helps.

[@rachelcorelle9485]

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

[@crowsmathclass]

You’re welcome. Glad it helped.

[@dianamay6115]

Thank you! Saved me from stress

[@crowsmathclass]

You’re welcome. Glad it helped.

[@jordan-otss]

Better explained than my professor. Good on you sir!

[@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]

You’re welcome. Glad it helped.

[@lindaseem580]

Thank you for this helpful video!

[@crowsmathclass]

Glad it helped.

[@madmarie6318]

This is so helpful! Thank you!

[@crowsmathclass]

You’re welcome. Glad it helped.

[@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.

[@vahlahri]

Thank you!! You explained it so well

[@crowsmathclass]

Thank you. 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.

[@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.

[@atpole818]

Liked and subscribed. Thanks for the help

[@crowsmathclass]

Thanks. Glad the video helped.

[@reemakhalid4558]

this is very helpful thank you so much

[@crowsmathclass]

Glad it helped.

[@jasonvoorhees7239]

Thanks Dr Eugene Porter

[@shanefromoutin9619]

So clear bro thanks for the help

[@crowsmathclass]

Thank you. Glad it helped.

[@tamannatania1122]

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

[@crowsmathclass]

You’re welcome. Glad it helped.

[@brennawelsh2288]

thank you so so much!! so helpful!!

[@crowsmathclass]

You’re welcome.

[@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??

[@shyannflagg6076]

THANKKKK YOUUUUUU! You saved my life

[@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

[@auroradiaz8327]

You saved my life!!!

[@crowsmathclass]

Glad it helped.

[@12tribesalpha]

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

[@crowsmathclass]

Typically n equals the frequency.

[@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.

[@zigapinteric2197]

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

[@crowsmathclass]

Thank you.

[@liamkirkpatrick3073]

Thanks so much!!

[@crowsmathclass]

You’re welcome.

[@thekings6128]

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

[@crowsmathclass]

Thank you. Glad the video helped.

[@somethingaboutstatistics5537]

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

[@xEpTICSHOTZz]

this was awesome

[@crowsmathclass]

Thank you. Glad the video helped.

[@multanitigers9816]

Thnks professor from Pakistan❤️👍

[@crowsmathclass]

You’re welcome. Glad it helped.

[@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?

[@nontandoyenkosimokoena8061]

Thank you ❤

[@crowsmathclass]

You’re welcome.

[@daniela5447]

THANK YOU IM GOING TO CRY I FINALLY UNDERSTAND

[@crowsmathclass]

Glad the video helped.

[@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.

[@samosorno7585]

LIFE SAVER!!

[@crowsmathclass]

Glad it helped.

[@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

[@user-dd5ny8nw7i]

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

[@crowsmathclass]

Probably rounded.

[@johnmiranda849]

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]

@@johnmiranda849 Yes. For online homework I wouldn’t round.

[@asantisibomana3]

Thank you

[@crowsmathclass]

You are welcome. Glad it helped.

[@salmadavila352]

life saver

[@crowsmathclass]

Glad it helped.

[@donnewagush3248]

thanks a lot

[@crowsmathclass]

You're welcome. Glad it helped.

[@TheCarebearstar]

Good vid

[@crowsmathclass]

Thank you.

[@itsria5984]

fr thank you

[@crowsmathclass]

You’re welcome.

[@tomassedlacik7236]

helpful, if you need to recall it, thanks

[@crowsmathclass]

You’re welcome. 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.

[@princegarcia9034]

Wow

[@amithfernandes8037]

D

[@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

[@sechabachalale7520]

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

[@yusufbodamjonathan9874]

Thanks so much!

[@crowsmathclass]

You’re welcome.