Probability (part 8)

[Oyugi100]

I love this guy..you actually make studying fun:-)

[lucascg1]

i am shocked! i'm currently studying project management and one of the courses in my program is Quantitative analysis. The previous lecture we were studying Bayes theorem and the entire time i was confused. I knew i needed a tutor. up until now... you have a gift, you have a way of explaining such complex concepts in such an easy, intriguing fashion. I cant believe i understand this gibberish now! THANK YOU KHAN!!!!!!!!!!!!!!!!!!!!!!!!!!­!!!!!!!!!

[igortyulkanov]

Great one. Thanks to the graph in previous one I grasp the whole idea much easier. Just by looking to the graph I can tell that the percentage of 2s coin area prevail over the regular ones. And if you divide the area of 2s coin by whole area of event we looking for (5/5) it will be more than 50%. Which been proven in this vid.

[paulceltics]

1 lost

[ofka8D]

i am totally gonna use this for my a level revision!!!!!

[dara1rock]

you are KUMAR!

[mgmanoj]

nice video i understand thank you khan academy.

[dwigzo15]

thank you,God bless

[dwigzo15]

thank you

[Jackckw]

Thanks a lot^^ This really help me in my final^^

[kevchern]

YOU ARE AWESOME!!!!!!!

the probability of you teaching better than all the math teachers ive ever had before.... UNDEFINED!!!!!

i actually understand now!! thank you so much :D!

[saionjik]

Thanks for the video, but I wish you were more alert. Too many mistakes that just throw you off, doesn't help when you already cant pay attention to probability even if you really want to learn it. Love the DE videos though. :)

[matrixener]

The next video IS called Permuations, i just checked the playlist

[fvrts]

awesome! can't believe I had so much trouble with this... your visual representation helped to convey the theorem extremely well

[Oh4Chrissake]

Brilliant.

[AdenoidHynkelThe2nd]

Next video is Permutations, I think.

[0001kd]

Bayes theorem...hella freaking cool!!!

[HairLikeCottonCandy]

It gets very existential at the end, lolz

[TheCriticalGouge]

Nice!

[treemantris]

The next video in this probability series, essentially part 9, I think is entitled "Conditional Probability and Combinations", the one that's 16 minutes long.

[yasir275]

hello guys can some one tell me whats the name of (Probability part 9) video exact name please

[Argel14]

what is the name of the next vid ?????

[nextblain]

@Argel14 go to his website its all listed properly

[oxyman728]

whats the next vid????

[dalemillssydney]

It would be great to know what level this work is suppose to be. Senior High School? University?

[thelemur]

im having this in uni, undergrad lvl. (bachelor)

[mhsamsim]

im having it in calculas high school

[OddworldExodus]

Thanks you so much for these videos! And thanks so much for not using Venn Diagrams or just theory! My professor only rambles on about the theory and never talks about applications. I'd probably fail this class if it weren't for you. Pun intended.

[cheezcola]

next video is not part 9 if you are looking :D

[DevastacaoTotal]

I wish you could do some videos on probability theorem proof, some problems are a pain to prove! Also you could have illustrated this with ven diagrams, I think they are more intuitive and less confusing :) These 8 videos are great for people who are giving their first steps on probabilities, I recomend!

[jackalxyz123]

Super ! Too good. Thanks for your videos.

[ose90]

A little bit of thinking + Sal's explanation = total understanding! Thanks Sal, now I know how to use the box to solve conditional probability problems :)

[ose90]

For people who don't understand, I can tell you that it needs a little bit of thinking and intuition.

Look at the box again. to find p(2s | 5/5 H), we are gonna find the region inside the p(5/5H) which is caused by 2S coin, this essentially means that out of all coins result 5/5H, we want to find those coins that are 2S... and this coins are P(5/5H n 2S) which equals to P(5/5H | 2S) . P(2S)...

P(2S | 5/5H)= P(5/5H n 2S) / P(5/5H) = p(5/5H | 2S). P(2S) / P(5/5H)

[superheroesarereal]

oh my goodness thank you for explaining the reason behind it. I haven't understood this concept all semester because I was just trying to memorize the formula

[BroAbdul]

Sal, I appreciate the way you stress intuition as opposed to straight memorisation. By drawing the rectangle I saw the answer would be a ratio. Now I know the ratio is Bayes. Thanks

[markuc]

Wonder video again!

[wiiooiiw]

brilliant example, and nice way to explain bayes theorem. thank you.

[Nanumir]

cool

[Roshibear]

If you get 5/5 h, 12.8% if the time. 2.8% of the time this happens when you pick the norm coin. Bayes' theorm then says that if you get 5/5 heads you picked the norm. coin 78% of the time. That is interesting, but I am not immediately getting the relationship. It seems high, considering that since approx. 3% of time I get 5/5 heads is due to me picking the norm. coin, I can approx. 80% sure than when I due I've picked the norm. coin.

Any help?

[Roshibear]

Let me repeat my last statement more clearly. It seem high that I can be approx. 80% (32/41) sure that when I do get 5/5 h, that I got it because I picked the normal coin, when only approx. 3% of the 12.8% of the time I do get 5/5 h happens when I picked the normal coin. How can this be?

[diegoAmaradona]

? Don't understand what u are saying but, when u get 5/5, he says 80% chance that what u are holding is a 2 head coin, not normal coin.

[TheMstrLaw]

I think the probability of having 5/5 heads 1/10 * 9/32 in your previous video? =)