Find the probability of pulling

a yellow marble from a bag with 3 yellow, 2 red,

2 green, and 1 blue– I’m assuming– marbles. So they say the

probability– I’ll just say p for probability. The probability of

picking a yellow marble. And so this is sometimes

the event in question, right over here, is

picking the yellow marble. I’ll even write down

the word “picking.” And when you say

probability, it’s really just a way of

measuring the likelihood that something is

going to happen. And the way we’re going to

think about it is how many of the outcomes from this trial,

from this picking a marble out of a bag, how many

meet our constraints, satisfy this event? And how many possible

outcomes are there? So let me write the possible

outcomes right over here, so possible outcomes. And you’ll see it’s actually

a very straightforward idea. But I’ll just make sure that

we understand all the words that people might

say, so the set of all the possible outcomes. Well, there’s three

yellow marbles. So I could pick that yellow

marble, that yellow marble, or that yellow marble,

that yellow marble. These are clearly all yellow. There’s two red

marbles in the bag. So I could pick that red

marble or that red marble. There’s two green

marbles in the bag. So I could pick that green

marble or that green marble. And then there’s one

blue marble in the bag. There’s one blue marble. So this is all the

possible outcomes. And sometimes this is referred

to as the sample space, the set of all the

possible outcomes. Fancy word for

just a simple idea, that the sample space, when I

pick something out of the bag, and that picking out of

the bag is called a trial, there’s 8 possible

things I can do. So when I think

about the probability of picking a yellow marble,

I want to think about, well, what are all of

the possibilities? Well, there’s 8 possibilities,

8 possibilities for my trial. So the number of outcomes,

number of possible outcomes, you could view it as the size

of the sample space, number of possible outcomes, And

it’s as simple as saying, look, I have 8 marbles. And then you say,

well, how many of those marbles meet my constraint,

that satisfy this event here? Well, there’s 3 marbles

that satisfy my event. There’s 3 outcomes that will

allow this event to occur, I guess is one way to say it. So there’s 3 right over

here, so number that satisfy the event or the

constraint right over here. So it’s very simple ideas. Many times the

words make them more complicated than they need to. If I say, what’s the probability

of picking a yellow marble? Well, how many different

types of marbles can I pick? Well, there’s 8 different

marbles I could pick. And then how many

of them are yellow? Well, there’s 3 of them

that are actually yellow.

What if you have a time series and want to compare to see the probability of another time series based on the first time series? Hope you understand my question.

Can someone tell me how one goes about ordering Khan's DVDs?

I think somebody lost their marbles…

400k views with 4 comments. now 5 because of me

Math is bad

Thank you! I was making it so much more complicated than it actually was 🙂

Thanks for the video.

Allah may bless you 🙂

Here's a question that's been bugging me.

You have a sac of four marbles. A red marble, a yellow marble, a blue marble, and a white marble. If you pull two marbles out at a time, how many ways could you end up with a red marble?

Is it 6 ways or 3 ways?

RW, RY, RB

WR, YR, BR

To me, a pairing of Red / White is the same as White / Red and doesn't count as a different way. That being the case, the first three pairings are the same as the second three pairings and thus its only three ways instead of six. Since I don't know the answer I am left to only speculate as to whether my logic is accurate or flawed.

Hi, I would like to know what are you using to write down the marbles etc…? Thank you ^^

Thanks for making it more complicated I really needed that 🙄🙄😒

Why did i take prob and stat, what was i thinking

khan needs better wrighting

IT WORKS IT WORKS…………THE DISLIKE BUTTON WORKS!!!!!😱😱😱😱😱😱😱😱😱😱

thanks

820,208 views but 394 likes and only 28 comments now. Wow…..

i think he's re watching the video or paying people.

did not understand any thing ….. the most stupid vedio

Thanks that's an amazing video

i hate math

iM SO CONFUSE

Fake

thanks it helped me alot

I sure love meth!

Understanding but confusing5

Anyone know what to do if it asks “What’s the probability of pulling a yellow marble twice?”

Sample Space is a very fancy word

maths is so easy

thank you! i'm relearning statistics and this video was very helpful 🙂

Write with your hand

I love math thanks sir

help!!!

I've Always been hating Math. AND…still I DOwho said math is life?

Love u man you are awesome I am going to get a high score on this test now!

wow

I can not understand only please explain nicely ok

THANK YOU SIR

Dear maths…you have officially made me lose my MARBLESSSS!!!

Omygad thanku ilysm

Who can help me with a Business Statistics question?

Thanks

Thanks for making it easy to understand

omg this man is a legend

My teacher makes it seem harder than it really is

Thanks

Me:Watches video

Me:Does not understand

Me: Picks a random answer

1 Million views… WOW

I still dont get it… i loterally have to work out whats the probability of rolling a 6 on a dice three times in a row im literally about to top myself

very helpfull thanks

Is that fraction is the final answer? ..

Wait, so the answer is a fraction….🤔NANI?!!!

Thanks for saving my life i love u