Calculating Probability - " And " statements, Dependent

[112233mode]

i have question teacher :)

ok y did u say at the probability of pick red ball it is 9/19 why u didnt say it is 10/19 ??

becoz if he is gonna pick a blue one so the remaings will be 10 red and 9 blue and the total will be 19 so the probability of getting a red one will be 10/19

thx i hope u answer asap :)

[ss121ss121]

شكراً

thank you

[EMINEM6890]

THNX again! :)



[buttercup6vic]

so I have a question....what do i do when i have three events that are dependent on each other? ie i have S: 10 red marbles and 6 blue marbles so what is the probability that I get 1 red and 2 blue marbles if i select three marbles randomly?

I worked out first taking a red , then a blue with the reduced total sample space and finally a second blue with reduced blue and reduced total sample space. but then this could happen in 3 sequences, do i * the results together or + results?

[007myzorro]

Yes definitely, the united states of america is a great intellectual nation that i admire and this is for a great part due to people like you patrick and this compensates the excesses of that nation. Do so further please. Bernard. Belgium. (my english is what it is, sorry but i speak with my heart and heart langage is universal..).

[007myzorro]

merci beaucoup de votre dévouement et de la consatnce avec laquelle vous enseignez les maths, cette branche si importante!!!. on se sent bien quand on vous écoute!! bernard from little belgium

[nooshin159]

wow.. i wish u were my teacher..i would love learning things from u :D ur videoes were of great help to me.. keep it up :)

[rippertimmy3491]

I don't know if this means anything to you, but you are a 100 times better than my UCLA math professor.

[monti369114]

thanks Patrick this very helpful, keep the good work!

[Jarrodmontelius]

patrick you are my 105 mathamatics teacher. Since my real one sucks lol, ty your style of teaching is very easy to follow.

[patrickJMT]

@Jarrodmontelius ha, hope it is going well!

[mahriahmac]

thank you sooo much! you make it easy to understand! haha

[JMShuffield]

Very, very helpful! Thank you!

[djhuab]

THANK YOU SO MUCH!!!!

[ethereal204]

thank you!!

[TheDiscriminant]

Thanks for your kind sharing!

It helps me a lot

[HEYARNOLD5]

Thank You!

[lilmizsudan]

Dude you rock!

Awesome work!

I actually understand probability now!

Thanks dude!

For sure now I will pass my maths test!

Keep Up The Good Work!

=] =] =] =] =]

[shardpiece]

Dude, you rock. I find it admirable that you would offer services like this for free. Thanks for helping me with the understanding of this elementary probability concept

[Necrozaur]

in romania we do this stuff at elementary school... imean 5-8....

[MattRadioheadhead]

Yes, your country is a leading intellectual nation.

[GroundwarZeroHour]

@MattRadioheadhead

Huh? U serious?

[LegendOf1970]

What if you do not succeed on the first try and draw a red marble. How does the probability change then? Do you just have to multiply the second probability by 9/10?

[timar03]

it would be 10:20 x 10:19

10 blue

19 total

[blackha368]

If you do not draw a blue marble on the 1st try, the probability of drawing 2 blue marbles becomes 0. That is why you assume you are successful the 1st time when finding the probability.

[THEAZBLINK]

Yeah, but well, he's working you know, assuming that the first one would be blue.

As he said "If we draw the first one and it was blue, what is the probability that we'll get a blue one again in the second time?"

[TakGSeries]

So if this situation were independent, your probability of getting two blue marbles would 10/20 multiply 10/20 giving you 25%?

[Darkfox107]

Thank you so much. this helped a lot.

[patrickJMT]

wonderful, glad to help

[eddsson]

Thanks, was just thinking about that and youtube to the rescue. As always.

Though, you got it all mixed up. It's obviously blue/red rings of some sort! Hehe.

[patrickJMT]

ops! i got confused!! : )

[moni94587]

Wonderful explanation. You've helped me a great deal. Thank you.

[patrickJMT]

no problem! glad to help!

[wobina]

Thank you so much for these videos! You are helping me a lot this semester.....

[patrickJMT]

perfect! i did not know if anyone is really even watching the probability videos...

[wobina]

Yeah I'm watching them. I'm taking math for the liberal arts and we are doing probability right now so they are helping a lot.