Introduction to Random Variables

[igalbog]

Sal, you're great. You teach as if you're doing this for your best friend, and it is clearly felt throughout all your videos. Thanks!

[1sanjaygir1]

This is the future of schooling. Thumbs up if you agree!!

[gonchienelmundo]

you are fucking awesome man. keep rocking with these videos, seriously.

[shameer304]

thanks

[idster7]

I am curious as to how the interactive transcript for these Khan videos were made. It seems much better than the usual computer-made transcripts. But yet I did spot an indication of a computer's confusion: 4:52, "accountable number" when Khan actually said "a countable number".

[sakrassa]

1/5 = 1 half

[declined80]

I know this sounds silly but I noticed a little mistake at 11:31. you said "One sixth plus two sixths equals 3/6 OR ONE HALF" perfectly correct, but you actually wrote 1/5 instead of 1/2. Otherwise this vid is great. extremely helpful

[mls20]

I almost jizzed my pants when you started writing exactly what my professor was wriiting and I was still following along

[TheSteelArmor]

Thank you. We need more people like you Khan. Thank you!

[MasterBeatles]

thx to bill gates for this site :)

[qdpiel]

THANK YOU SO MUCH

mrvlhs is so right!

[NuxlyStardust]

It's kinda weird that there's an infinite number of possibilities between 1 and 2. Because it means there's infinity contained in a finite "space". Weird weird weird.

[Agilulfa]

Thank you so much! I'm trying to remember math for my GRE. I was good at school, but it's been a while since then... and I can recall Algebra better than Statistics. This has been really useful.

[TimmysMummy]

I hope these vids are available when my kids are school age... I use them now for uni... and think they are fantastic!! xxx

[AleifrLeifrson]

They really should teach more of this and less of calculus before university. Unless you're an engineer or a scientist you're NEVER gonna use calculus, but statistics and probability can get fun and useful very fast.

[TwistedLemniscate]

@AleifrLeifrson yeah, but it might be useful to mathematicians being that practically all of probability (not the basic basic stuff) is derived from calculus

[GR530]

THANXXXXX

[edus82]

towards the very end you accidentally put 3/6=1/5 instead of 1/2

[bobpower]

YES WE KHAN!!!!!!!!! :D

cheers for savin my ass on many an occasion man!!

[paulceltics]

LOL 3/6 is not equal to 1/5 just saying

[Rayhuntter]

@paulceltics u dont say! u must be some genius

[mohdban]

@paulceltics it isnt?

[paulceltics]

YEAH YEAH YEAH!!

[bournefury]

IT MAKES SENSE! Omg,it makes sense! THANK YOU

[tylerwweston]

cool...

[tylerwweston]

cool

[tylerwweston]

cool

[kris1227]

Awesome Vide0. Great Job!!

[Hilariousity]

you're my hero! Can you also teach me how to get laid?

[MIMIOSBO1]

Great video simple and easy to understand!

[gvclm]

The definitions are not explained in a rigorous way. You can use it when you are interested in measuring some aspects of a specific random experiment. But it is necessary to use better references when you want to manage random variables with other purposes (research works, doctoral thesis, ...)

[SixtyOfDBLn]

Guys go to your address bar and type the word "win" between the words "you" and "tube"

[BboyWonTonSoup]

HOLY SHIT TY SO MUCHHHHHHHHHHHHHHHHH

[chi94]

you made a mistake, you wrote 1/5 instead of 1/2.... the student became the master

[Rogposhi]

Do you effin rule...?!

[XxWearsMexX]

@ 11:32 u said 1/2 but u wrote 1/5 XD

[TheJsc1983]

thanks for the video, its really helpful,

[111anaa]

can you plzzz do a video on markov chains and commulative distribution functions.. your vidoes are great :))

[lost50]

the end should be 1/2 not 1/5

[yaziyo]

It's so refreshing watching a maths lecture and knowing what is going on for a change. :)

[assya090]

you are awesome, thanks!

[renj3000]

can you do a video on quartiles percentiles and stand score

[JeremiahPTTN]

I wish the teaching I'm paying for was more like this...

[bajahey]

I appreciate your educational videos. Thanks a lot!

[otisranson]

Your videos are great! Keep at it!

[ushan1999]

Thank you sir for all ur videos its awesome great....It helped me a lot for my probability and stats exam..thank u again

[maiie5]

Nice video, however the cursor is kinda disturbing.

[gennkill]

another great video! thanks man

[doopie88]

there's a mistake at 11:30 it's 1/2 not 1/5

[sean0101a]

Nice videos! Is the X used by convention for random variables the Greek letter Chi, like the chi squared distribution?

[JKaiserable]

thanks brother

[arisraz]

wonderful video for review..

[hsktoadftw]

i apreciate this much so much

[Shintsui]

awesome tutorial, thank you so much for this video.

[nonconservative]

wow so much better than videos on mystatlab

[nikkisacapilo]

thanks man!!

[bluesmoon]

correction: right at the end, that should be 1/2, but you wrote 1/5

[nathanbelete]

listen

[aozcakir2]

watched on Jan 04,

Thanks

[mrvlhs]

You wouldn't believe how shitty my teachers can be... such easy stuff to learn in 10min and I couldn't learn it from them in 1h. Thank you a lot, this is worth gold

[SHITONASTICK1100]

@mrvlhs hahaha u must be studying at the same place as me

[khalidwalankar]

you are the best!!!!...i study @ carleton U in ottawa,canada.and i have a final tomorrow morning.and to be honest,the book is not helping @ all!!!

but you are :)....thx sal,best teacher ever :)

[Moongalz]

I totally agree vvith you the book is really not great! this guy is avvesome.. I'm also in that course. mine vvas on the 12th but shifted to the 14th for an exam conflict... vvhat did they kinda include?

[stephan1848]

Thank you Sir! The fog slowly starts to disappear ...

[lifeintechnicolour4]

Thank you sooo much.

You're making my life exponentially easier.

[danisjustcool]

great video...i can't uderstand anything from the coded definitions given at university.

Thanks a lot

[uburex97]

1: these videos are awesome. it isn't just math students who are watching; I am a 45-year-old ex-investment banker trying to retool with mathematics. You have managed to make both calculus and statistics (thus far) very straightforward. All I need now is something on CAPM...

2: 'Dice' is plural! I'm an opinionated old British fuddy-duddy, - you should be saying 'die'.

alea jacta est

[newyorkparispeckham]

Massive thanks for posting these. Huge help.

[trainedtiger]

You are awesome Sal. Thank you very much. God will bless you for doing this.

[kingsman12]

so far so good... thx for postin this

[TajikThunderstorm]

I cannot describe the ability of this man, pure class.

As for my maths teacher, absolutely rubbish I ll be better off watching these videos than attending my poor maths classes.

[ken1byn]

why don't we have profs like this guy at school???

[Boomerang3378]

"There's an infinite number of numbers between any two numbers" HAHAHA. Dude you're the man!! keep it up. Excellent videos!

[lIlusions]

why the hell am I going to college? I learned everything we covered in class in one day. And its been a couple months in!

[talatmukhtar]

it made my life easier, thank you for your work

[Sontakker3]

you're a hell of alot better than my prof, thanks

[YusukeYurameshii]

I have a ststs lecturer with a heavy chinese accent too! I did not even know how to pronounce poisson or mu till I went on you tube. He cracks me up when he says take half of alpha. "harfa arfa" lol.

[sattiasad80]

LOL

[braverysecrets]

you are right, but I said that spontaneously. Thanks man even though nobody gives a shit about what i said!

[braverysecrets]

thank you thank you thank you, you saved my ass from FAIL. I have a horrible chinese prof.

[Numkeenkhan]

Great lesson...that's what "we" have invented internet for...long live technology:)

[thedemonlovers]

Very useful material :) found this video very helpful..

[DanMan7997]

I read that the probability density function (pdf) is only for continuous variables, and the probability mass function (pmf) is for discrete variables. Is this correct? In this video Sal refers to both the discrete and continuous variables with a pdf, so I'm a bit confused.

[jiaojunfeng]

very good, i love ur class,

[jjasonmcclure]

Me too...

[footage82]

RANDOM?!

random like my head... with no sense at all!!!

ur all too scared for me....

[soccersoul72]

yo!!!!

[noobtube87]

gr8 stuff dude

[itrustbirth]

Thank you for posting. I am struggling through Statistics this semester. I will be taking my final exam in 8 days. Your videos are very helpful.

[1228am]

excellent video ... one of the best tutorials on this topic ever ! ... thank you soooooo much for helping me out :)

[Djhg2000]

3/6 = 1/2, not 1/5 ( 11:30 ).

Otherwise, great video!

Every video that I've seen from khanacademy has been really good!

[bilbobo]

What are you guys rating that negative? He/She is right so a + here

[smedheat]

u rock

[ditc83]

thanks a lot. it helped in my stat416class.