Discrete and continuous random variables | Probability and Statistics | Khan Academy

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Defining discrete and continuous random variables. Working through examples of both discrete and continuous random variables.
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Probability and statistics on Khan Academy: We dare you to go through a day in which you never consider or use probability. Did you check the weather forecast? Busted! Did you decide to go through the drive through lane vs walk in? Busted again! We are constantly creating hypotheses, making predictions, testing, and analyzing. Our lives are full of probabilities! Statistics is related to probability because much of the data we use when determining probable outcomes comes from our understanding of statistics. In these tutorials, we will cover a range of topics, some which include: independent events, dependent probability, combinatorics, hypothesis testing, descriptive statistics, random variables, probability distributions, regression, and inferential statistics. So buckle up and hop on for a wild ride. We bet you're going to be challenged AND love it!
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Опубликовано:

5 дек 2012

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Комментарии : 395

@Zhim94 4 года назад

For those who don't quite understand, discrete R.V is for counting; continous R.V is for measuring.

@abhineelnandi8211 3 года назад

Entire Video in a single line.

@notjin2109 3 года назад

what’s the difference between counting and measuring

@user-en5gm1vw3c 3 года назад

@@notjin2109 counting means for example we count monthly income of a person but we will not measure that... Same way we measure the weight of a person but we don't count that

@notjin2109 3 года назад

1234 5678 I would like a difference that doesn’t rely on examples because i can’t think of a difference that linguistically matters

@anaforero6108 3 года назад

@@notjin2109 Discrete is a word used to refer to something that can have "separate fixed values", one example is integer numbers. Continuous is a word to refer to things that are difficult to assign a separation between two things (values), or in other words: that separation can be neglected (one number is exactly next to the other number).

@judsonl8990 3 года назад

I'm going to COVID's version of a university right now - these Kahn Academy videos are way more helpful than my stats professor.

@cashele 3 года назад

tell me about it!

@pradipteeshrestha4097 3 года назад

I'm not in college, but I am a senior taking an AP Stats course and my teacher isn't much help, so I agree! It's my worst class this year and never understand what's happening.

@briantarrant4907 3 года назад

no kidding

@andrewperez8190 3 года назад

bruh for real..same

@arianachu9834 3 года назад

me either

@mainguy5387 10 месяцев назад

I asked Chat GPT to explain like im 5 years old "Alright, imagine you have some marbles. Discrete variables are like counting how many marbles you have. You can have 1 marble, 2 marbles, 3 marbles, and so on. Each number is separate and you can't have half a marble or a quarter of a marble. Now, think about a jar of water. Continuous variables are like measuring how much water is in the jar. You can have a little bit of water, a medium amount, or a lot, and you can also have in-between amounts like half-full or one-third full. There's no limit to how much water you can have, and it can be any amount, not just whole numbers. So, discrete variables are like counting marbles, where you can only have whole numbers, and continuous variables are like measuring water, where you can have any amount, even parts of it."

@DerrickTay88 8 лет назад

I dont usually comment on such videos. But this is way too easy to understand from his explanation. I would have A's any class if all my lecturer are like him. Thumbs Up !!!

@feljmusic 4 года назад

big yes

@pearcei 9 лет назад

we spent a whole day on just the definition of discrete vs continuous variables in class and i still didn't know it and then i learned it in less than 3 minutes here

@billionaireconcepts1095 6 лет назад

us too

@marijnb4191 6 лет назад

I still kinda struggle with that, maybe you know what thing i dont see

@atiqtajwar1783 6 лет назад

Rebecca Mae me too

@MookaMG 6 лет назад

I feel you. Having a bad teacher sucks.

@gunbilegt 6 лет назад

Same here

@cashele 3 года назад

"the New Orleans zoo where I grew up" lmaooo

@killerqueen5624 Год назад

I like the small snippets of commentary that are added into the lesson, like ants learning interstellar travel and how Usain Bolt is aging. It makes the video so much more fun to watch lol.

@pervertbismarck5067 4 года назад

I learnt more in 11 minutes than 1 months. We need more teachers like him.

@khushigupta5904 6 месяцев назад

Khan Academy, you guys are doing a wonderful job. I was feeling dumb in class when it came to this topic but now I understood everything. Sad to see how the classroom learning doesn't help most of us.

@AIONBERSERKER 8 лет назад

My professor made this whole thing seem so complicated. You explained it in less that 15 minutes :D

@khanacademy 11 лет назад

Good question. It is not a question of the size of the population you are sampling from. It is a question of the possible values that each sample can take on. Mass can take on any value (including an irrational number if we don't get caught up with quantum mechanics) so it is a continuous random variable.

@jonathanlind5725 10 лет назад

Very good explaining, I've had a hard time distinguishing the difference between disc. and cont. variables and you managed to tackle the very questions I had. Thank you!

@thinkfeelsolve 4 года назад

Thank you, sir. Discrete random variables cannot be broken down into decimals or fractions. There is no half an ant or half a person. but there can be half a second and one-fourth of a meter. Discrete things are counted. continuous things are measured.

@shaansinghsingh1113 Год назад

live safer thanks gang,

@s_kaukab 3 года назад

That was one good explanation, I've always stumbled upon how the heights or weights in a class are not discrete random variables, thanks Sal!

@Chloe-jz4pr 4 года назад

Thanks for this video!! I was learning these definitions through online school due to quarantine and I just couldn't understand it. But this video helped me to finally get it. (:

@alfianabdulhalin1873 8 лет назад

LOL! Polite variables... Thanks for the great vids tho! Helps a lot with the fundamentals!

@mithurajdas225 4 года назад

a good example of continuous random variable:Reading the temperature of a room throughout the day ,its continuous since the temperature does not jump from 20 degrees to 22 degrees.so its continuous process.

@davidthomas9276 6 месяцев назад

Right. And that is the problem I have with the zoo animal mass example. The masses do jump from one to the next,. They do not take on every value within the range. If you plot the masses, they are distinct, separate points. Thus, to me, the variable is discrete.

@amalnazir8140 3 года назад

Why is no one talking about when he said “maybe some ants have figured out some interstellar travel” 😂 7:58

@deborahachor9831 8 лет назад

thanks a lot,i was reading my course material and i did not understand anything.but with this video there is clarity and simplicity

@msentence1 3 года назад

Thank you for this. I’m able to understand now. Your explanation and examples helped a lot.

@roseobregon 5 лет назад

Thanks for the great examples! It cleared up a lot of confusion!

@skatershawn410 7 лет назад

Love how he called out Bolt would win in the 2016 Olympics!

@thomasip9938 7 лет назад

You are a lot clearer than my teacher!

@muhannadalturk7548 4 года назад

very clear explanation. I find your channel to be extremely helpful!

@sina4255 2 года назад

that moment when u realize the video is mentioning 2016 as a future year

@yayatoure4427 7 лет назад

Thank u so much man, really appreciate it

@sumit121285 3 года назад

its definitely clears our confusion in between discrete & continuous random variables..... thankyou sir , thankyou so much....

@elizabethafu8182 7 лет назад

This video helped me so much thank you wish you were my professor! thank you thank you thank you!!!!

@tarunt9153 Год назад

Just looked it up, the teacher was pretty much on point, elephants range from about 2,000-7,000 kg. (4,000-14,00 pounds)

@deathsangel123 10 лет назад

Thank god for your videos! Have my stats final on Monday and this really helped me understand what is going on.

@RB3Vids 10 лет назад

Thank Science

@PolskaBabii 4 месяца назад

I have been using your videos for quite some time! Cant believe you are from New Orleans! Awesome

@bibekanandabhattacharjee952 3 года назад

You are just too good at explanation. You are so articulate. Please continue with your style of teaching and don't get distracted by your critics. If there is one person who dislikes your style there are 100 others who like your lectures. Please carry on. I now know what is a RV. :-D

@TamiProvost 7 лет назад

Great lesson and visuals! Thanks so much! :)

@chuuyang5608 4 года назад

Thank you for this! It helped a lot.

@princessmeimban8244 4 года назад

I thought i lost hope in understanding the discrete and continuos r.v ....then i watched this video!! IT WAS SO EASY to understand thanks

@reeceperry2237 Год назад

Glad to hear you are from New Orleans. Currently studying for my stats final at Tulane.

@hinekanter1150 9 лет назад

This was so helpful! Thanks you

@elizaeliza3907 5 месяцев назад

This is a very good explanation. My lecturer used the same examples as yours, probably watched ur video and I still couldn't understand. Now all is crisp clear

@zerwinandrepanganiban3869 5 лет назад

That last example enlightened me. Thanks for this vid

@thewisearchitect Год назад

You have explained a tricky topic in a very easy to understand way. Thank you.

@mariasaidawi3982 7 лет назад

Thanks a lot... I finally understood them.

@mariachow4353 8 лет назад

lol when he said, "discrete can mean polite. we are not talking about random variables that are polite."

@fernandopellegrini8598 7 лет назад

I´ve finally understood the difference thanks!

@RobertoSilva-hj9yn 4 года назад

Thank you very much, it was a very clear and helpful explanation

@kapamagicman 10 лет назад

Perfect sense....thanks!

@TheIanmurphy 9 лет назад

Bacterium is the singular form of the noun, and bacteria the plural form - always learning new stuff when I watch your videos!

@thecatman9o9 2 года назад

u seriously didnt know that??

@Unknowncuriousity Год назад

@@thecatman9o9 well he knows now

@lifelover9989 5 лет назад

This helped me a lot 😊 God bless you🙏

@user-zw3rg2go4o 7 лет назад

استفدت كثيرا 👍+ صوتك رائع ما شاء الله. thank u so muce

@ranaabdullahranaabdullah3296 2 года назад

I love you sir so much. I search from morning about some concepts like what is difference between Summation and integral. I watch your and other channnels vedios and also read 9 10 articles. I actually want to know that why summation is discrete and integral is continuous . I actually know that what does it mean that value is discrete and that function is continuous. I also know that why we take time approach to 0 in differentiation. So I searched and I found that basic after 4 hours search Thank you for clear my one concept and doubt.

@datsmydab-minecraft-and-mo5666 4 года назад

Amazing video, it feels like im using a cheat code! whenever i watch these videos, and understand it much better.

@divyashrees1771 4 года назад

This was amazing thank you for sharing this

@khadeshaalexander7096 4 года назад

thank u this made me understand things clearer

@msoclassychik 8 лет назад

lol Yes, Usain won the 100m

@the_growth_mindset. 5 лет назад

I honestly don't know where I'd be without you Sal !

@andrewzhu5294 6 лет назад

When I read the textbook on this topic, it just made my brain literally hurt. But when Khan explained this same exact topic, I understood it completely and I swear my brain relaxed.

@designhub360customapparel 11 месяцев назад

Thank you! I was about to drop this Business Analytics course at Udacity..

@AlexzandrSpringvale 10 лет назад

9:10 "It probrably be Usain Bolt, but it may not be. Actually he is again a little bit." That's classic Salman Khan.

@satyam100c 3 года назад

Thanks alottttt khan academy team for ur selfless service i will always be ur fan ♥️ and sir ur sense of humour is really great I haven't got bored for even a second....now i got to know ki " padhate kaise h"...ie how to really teach someone

@alykatequevasz4324 4 года назад

This is very helpful. Thanks to this video

@fishtacosyt8835 Год назад

Really helpful vid! If only my stats teacher was as helpful as you.

@romeofuertes633 6 лет назад

thanks your a big help i hope you have input some test on your video

@ms.angelicapagdilao6037 2 года назад

Thank you very much. It is very helpful.

@FahadAyon 2 года назад

Great explanation. Many thanks

@HopeAndrea_HFG 3 года назад

Thank goodness I came across this video. Why is my textbook so ridiculously hard for no reason?! Serenity NOW!

@oprabin 7 лет назад

2:36 bro, you grew up in a zoo? XD

@no_name_magician 5 лет назад

New Orlean's zoo to be exact.

@mrjrpnls829 2 года назад

You explained every details, you are better than my subject teacher ily 😭❤

@tarunveer5524 2 года назад

Thanks Sir. This really Helped me a lot.......

@ag6194 3 года назад

@khan’s academy: What about age? Is it discrete or Continuous or will it depend on how it is expressed?

@BasaltMyers 3 года назад

I think age can be thought of like when he did the year example

@nightstarry6350 2 года назад

If you think age in terms of how many years has passed (25-years-old, for example), then it's a discrete variable; If you think age in terms of the exact time, then it's continuous because it can take on any values (1.127287487847 year, for example)

@chinanumberone7723 4 года назад

Argued this with my friend today and he kept saying I was wrong when I was saying continuous is where it is like an irrational number, they can have no ending, no precise number, or infinite values within two numbers, I knew I was right

@MrDoraemon2100 11 лет назад

Superb ! Great video as always.Keep up your good works.

@mohammedsameer9149 7 лет назад

Usain Bolt won though lol

@Pilzman3000 7 лет назад

I thought I'd have to look for a while for that comment but here it is right at the top xD

@TheLezhenkin 11 лет назад

This is exactly what I did in my AP Stats class yesterday.

@pinkflower4424 7 лет назад

Thank you khan academy very much 😍😍😍

@Nadia2Lise 11 лет назад

Thank you!!!!

@nishchays 7 лет назад

"We're not talking about random variables that are polite" LOL :P

@CanthandleYasir 3 года назад

@@laiba621 its a special continuos discrete random variable

@rachelkimemia5897 4 года назад

merci beaucoup Monsieur :)

@CrackHeadsLegion 11 лет назад

I wish I had teachers like you

@jafarvalishaik9706 5 лет назад

Very Nice explanation on discrete vs continuous variables

@caojing6256 4 года назад

Very helpful, thanks

@nathamha 6 лет назад

In the lecture I attended, the teacher said the best way to tell the diference is to see if the numbers the random variable takes are natural numbers then it's likely a discrete variable, on the other hand if the value the random variable takes is a real number then it might be a continous random variable.

@somber087 Год назад

These short and free videos help me more than my paid teacher in an hour

@lekhayes13 5 лет назад

Excellent video!!

@ahlamadel5467 5 лет назад

Your handwriting is beautiful! Here is a student from Saudi. Thanks.

@yourflamingdeath2315 9 месяцев назад

Thank you once again sensei.

@fayolamaulida1663 3 года назад

Thank you so much!

@saarimshaikh6589 3 года назад

new orleans '"then you must have known klaus mikaelson"

@manmohansingh8211 5 лет назад

I really wish my lecturer were close to being this good at teaching

@climbmotoadv1550 2 года назад

thank you! good

@binhbietboi 4 года назад

Thank you very much.

@reemabdullah9905 2 года назад

Best Description ever! big like

@doreeen7697 3 года назад

This is video that we can learn easily about random V😊

@SaraAhmed-fp1vi Месяц назад

Hello, I am a student from Iraq, and I study mathematics in the College of Science. I love mathematics very much, and your channel is also very wonderful. Continue like this.🤍

@cherrymaeremedios9125 4 года назад

thank you so much for your youtube channel Khan Academy.

@divineestheticsskinhair5497 7 лет назад

I like the ant example.

@ExpatJoel 7 лет назад

good for you

@malachioom 6 лет назад

Interstellar ants

@aleenadaniel456 5 лет назад

good for you

@GAment_11 3 года назад

You make learning fun.

@user-ho9ni1hd6s Год назад

Thank you for being a better teacher than my professor

@user-ep8lb5tf6l 5 месяцев назад

Thanks for this i know how to now

@Physics_with_Muscles 2 года назад

Thank you!

@whattheydoexactly7794 4 года назад

Sal and grant will be invisible pillars of the foundation of next generation mathematicians. 100 years from now, people might forget about you but you would have created 1000 of mathematicians by then