Probability (part 5)

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Khan Academy

Khan Academy

Күн бұрын

Пікірлер: 60
@PQK
@PQK 15 жыл бұрын
Drawing a matrix really helps conceptually. Never quite thought about it this way!
@00DCSY
@00DCSY 11 жыл бұрын
It's talking about combinations for example getting 1,1 (2) is the same as 1,6/2,5/3,4/4,3,/5,2/6,1(7) so the chance of getting a specific combination is the same for all rolls, getting the total number is different.
@f1zzrawr
@f1zzrawr 12 жыл бұрын
I know I can akways count on this guy when in need. Keep doing your thing Sal!
@kw651
@kw651 13 жыл бұрын
Bummer about the "P(8) = 5/6" never being fixed to "P(8) = 5/36" that he meant to write. Still helpful video(s) in general. Love the grid!
@roygroup1
@roygroup1 13 жыл бұрын
Isn't p(8) = 5/36 and not 5/6?
@OPNURISYDER
@OPNURISYDER 11 жыл бұрын
I'm not sure yet about 3 dice, but using 4 dice would be easy. Using 4 dice the probability of rolling any number would remain the same as if you only rolled 2 dice. To make it easy, draw 2 charts, just like the one Sal drew. With 2 dice, P(4) = 3/36 = 1/12. With 4 dice, P(4) = 6/72 = 1/12. Just count the number of 4's on both charts and divide by 72 (36+36). With 2 dice, P(8) = 5/36. With 4 dice P(8) = 10/72 = 5/36. Any even number of dice, the prob. will be the same as using 2 dice.
@jstarks123
@jstarks123 14 жыл бұрын
@sagaralpha ...umm, nope...its 5/36... 3,2 or 2,3 or 4,1 or 1,4 or 4,4....you can't divide the denominator by 6 without dividing the numerator by 6...so 5/6 is wrong
@TheRealBigPlayas
@TheRealBigPlayas 9 жыл бұрын
Sal, you have 5/6 as the probability of getting an 8
@TheRealBigPlayas
@TheRealBigPlayas 9 жыл бұрын
Fail. I was pointing something out. Not saying its 5/6. Come on I know this is math...but read a little.
@TheRealBigPlayas
@TheRealBigPlayas 9 жыл бұрын
Wow lol. In my comment I simply pointing out he had a typing error, which you failed to comprehend for whatever reason. Forget that, your comprehension skills are below par, where have a said or given lesson on 'how we read to people' or is this just one of those times where you fail to make your thoughts clear.
@TheRealBigPlayas
@TheRealBigPlayas 9 жыл бұрын
Oh my god, you are an idiot. When have ever said P(80= 5/6
@TheRealBigPlayas
@TheRealBigPlayas 9 жыл бұрын
mido3ido1 I'm just going to stop here, your stupidity is truly astonishing, especially seeing you are unable to answer my question. But hey, I'll let you leave being a bit more intelligent. The noun is idiocy, moron.
@TheRealBigPlayas
@TheRealBigPlayas 9 жыл бұрын
Lol, trying to avoid that you misread what I read and now trying to insult me lol. I'm glad you are learning though, you didn't say "idiotness" lmao
@ShreeRamJayaRamJayaJayaRam
@ShreeRamJayaRamJayaJayaRam 12 жыл бұрын
thanks for using different methods for the same problem, which made things lot clear....
@wjmccartan6747
@wjmccartan6747 8 жыл бұрын
These videos are amazing, Thank you so much sir! :)
@KirstiTheSoulEater95
@KirstiTheSoulEater95 13 жыл бұрын
I think I'll be sticking to the grid - a lot easier to understand... Thank you!
@SandeepAmilineni0
@SandeepAmilineni0 7 жыл бұрын
We can use the word chance when a system is significantly random, or we should be using the word equally probable always
@Furzellewen
@Furzellewen 11 жыл бұрын
Sal, I love how you say 'simerally'
@OceanRiot17
@OceanRiot17 12 жыл бұрын
Saw the diagonal pattern right away lol, coulda filled that shit in uber fast.
@moutazeldeib9481
@moutazeldeib9481 7 жыл бұрын
in the last explanation regarding the prob. of getting five how you know that the total occurrence is 36, in the grid it is so easy
@Elpepe_0245
@Elpepe_0245 6 жыл бұрын
Thanks a lot chief
@nasagrad
@nasagrad 16 жыл бұрын
P(8) = 5/36. Nice videos. This will help me in my probability class I think
@taniakhan2031
@taniakhan2031 11 жыл бұрын
In example 2 does the dice has max 4?
@alecesar7
@alecesar7 15 жыл бұрын
you are not paying attention in what he said?? there are two dices
@sepulturak
@sepulturak 16 жыл бұрын
how can you get 7 on a dice when the max in it is 6????
@ripdarkside
@ripdarkside 14 жыл бұрын
Khan ur awesome helped me alot..... a pure genius! ;D
@SolutionsWithin
@SolutionsWithin 15 жыл бұрын
Hi. How come you count the 2 & the 3 & then the 3 & the 2 etc. can't u say order doesn't matter and only count the unique combinations?
@OPNURISYDER
@OPNURISYDER 11 жыл бұрын
You are right, the outcomes are not equally probable. That's why I loose money when I play Craps! Damn'it.
@Shahriar019
@Shahriar019 14 жыл бұрын
hey!! p(8) isn't 5/36!! it is 5/6!! you know what that means??? that means, a genius like you CAN make a mistake!! now i'll never....never ever feel shy when i make a mistake in future!!!!! rather i'd try to make myself better for the next!! take care :)
@barnabasmasanja7285
@barnabasmasanja7285 11 жыл бұрын
What if you have 3 or 4 or more dices, how do you do get the probability of a 4, 5 or 9 etc.? I'm a slow learner so, please, bear with me!
@anticorncob6
@anticorncob6 14 жыл бұрын
Those diagrams aren't always useful. I had to sit by this kid in class that I hate three times in a row. The chances of that happening is about 0.95%, which means I am pretty unlucky. Four times is 0.2%. I'll talk to my teacher if 3 turns into 4. I worked it out differently because there are 462 dfferent ways to sit 2 kids in my class like that and it would take forever to list the possibilities.
@bcorbett111
@bcorbett111 16 жыл бұрын
Great Videos!!! but you made a little mistake on the probability. You said it was P(8)= 5/6 when it should be 5/36. Good job overall
@ren-d2g
@ren-d2g 13 жыл бұрын
@lunolol what do you mean, "leave him alone" ?
@liar78
@liar78 15 жыл бұрын
its the sum of the two die that's why
@officialdiegofurlan
@officialdiegofurlan 14 жыл бұрын
I wish u were my stats teacher, I don't understand mine!
@gauravrai5784
@gauravrai5784 3 жыл бұрын
Messiah
@deadblock3
@deadblock3 12 жыл бұрын
thank you for reminding me off lol. i was confused
@hugstablebear
@hugstablebear 14 жыл бұрын
1 die, 2 or more dice. There are no dices, just like there are no mices. Alea jacta est.
@barak7287
@barak7287 15 жыл бұрын
פשוט מלך! מלך!!!
@scientia_potentia_est
@scientia_potentia_est 13 жыл бұрын
What???, prob. of 8= 5/6, isn't it 5/36 ?????
@LittleMew133
@LittleMew133 12 жыл бұрын
it's not probability of getting an eight or seven it's probability of getting a sum of eight or seven in the beginning I was like the dice has 7 faces :O XD
@wa00021
@wa00021 15 жыл бұрын
Greeeeeeeeeeeeeeat
@TheCriticalGouge
@TheCriticalGouge 15 жыл бұрын
Thanks again
@GMG320
@GMG320 3 жыл бұрын
💯💯💯
@marmaladeboyloveryuu
@marmaladeboyloveryuu 15 жыл бұрын
p(8)=5/36? (: your really helpful thanks(:
@liar78
@liar78 16 жыл бұрын
awesome...
@wiwiudiuhne
@wiwiudiuhne 13 жыл бұрын
you are wrong for the last example
@valeo626
@valeo626 13 жыл бұрын
yay monopoly
@anupamsinghi
@anupamsinghi 15 жыл бұрын
great
@michaelmagone
@michaelmagone 11 жыл бұрын
2013 comment !!!
@OmarAlHasan
@OmarAlHasan 5 жыл бұрын
2019 comment
@heliumfilledweeb3215
@heliumfilledweeb3215 6 жыл бұрын
there is no 7 on a monopaly die...
@Kornackifs
@Kornackifs Жыл бұрын
طعميه مش فاهم حاجه اد كده مر من هنا
@bee-baux8693
@bee-baux8693 8 жыл бұрын
supppppppp,.....woooooooooooooooooo
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