23 Comments on “Expected Value: E(X)”

• EMRAlvarez

  

  30 July, 2010, 23:05

  It is a great video, but the population mean is 3. 6 and the expected value is 3. So it cannot be the same? Any other reason to explain why this is so? I can not think of a reason.
• udaranga

  

  30 July, 2010, 23:34

  Thank you very much sooooooooooooooooooooooooooooooooooooooooo. . . . . . . . . . . . . . . . . for 10 months I struggled with this population, the sample and the expected value. And everything ended up in the 14. 52 minutes. . . . . . . . . Thank you very much. . . . I looked like this 10 months ago;. . . . . . . . . . . .
• AnneAnne9102

  

  30 July, 2010, 23:42

  Thank you ~! >
• Huntsong64

  

  31 July, 2010, 0:18

  Thank you! I am in 6th grade and our book that teaches basic probability results of the binomial, but it does not really tell us how to do it (I was absent). I came across this video and realized the problem had been with the expected value, not binomial probability.
• rakabali78

  

  31 July, 2010, 0:29

  Thank you thank you thank you a heap of all your videos (the download statistics, calculus, linear algebra and geometry:)). My current work asks me to pick up those things I learned back in UNI (which I forgot almost entirely). Thank you !!!!!! KhanAcademy
• subticnewjour

  

  31 July, 2010, 0:46

  Congratulations to the Khan Academy, I asked Khan Academy to keep posting more videos.
• bellarn0705

  

  31 July, 2010, 1:02

  Thank you for this excellent instructional videos. I try to teach myself about the statistics, and I hope your series of videos that I can pass the DANTES test statistics.
• petitm1

  

  31 July, 2010, 1:58

  You rule! Any plans to make modern physics? or Maxwell’s equations. And maybe some curl (flexion (E field))?
• mrvlhs

  

  31 July, 2010, 2:50

  It’s a bit difficult to distinguish the decimal values, multiplication and coma in your videos because of the low resolution. Maybe you could make more visible in the videos to come. Please take into account. Thank you:)
• 1limonche

  

  31 July, 2010, 3:03

  Great! I heard for the first time what it means to the expected value. Thank you! great explanation!
• lifeintechnicolour4

  

  31 July, 2010, 3:38

  Thank you so muchhhhh Yuya
• sanmathi1

  

  31 July, 2010, 4:03

  excellent work. . keep !!!!!!!!!!
• khyer123

  

  31 July, 2010, 4:52

  THANKS! I’m taking a class called Probability and application technique with a teacher who can absolutely appalling to explain anything, and who wrote a book that is equally useless. Thank you for choosing this kind of things more clearly:)
• wtube5

  

  31 July, 2010, 5:40

  Thank you!
• paulbryanjavier

  

  31 July, 2010, 6:18

  Thank you thank you. For people like me who has been with the school 10 years ago. . . Your videos are really appreciated! : D Keep it up!
• Ritzoid

  

  31 July, 2010, 6:34

  You hit the nail man, great job!
• cosmomarch

  

  31 July, 2010, 7:08

  because you have to calculate an “expected” or “should mark” then you must take into account the numerical values for the “categories”. if the categories are red, green, blue, then you would not be able to calculate an expected value in terms of numbers. but since these are the figures, it is possible to predict the most probable number by multiplying the score by the likelihood.
• CogitoErgoCogitoSum

  

  31 July, 2010, 8:03

  10:39 timestamp. Is that correct? Zero times a percentage? Zero isn’t worth it a category. . . right? Zero, one, two “shows” and the percentage of time are categorical. Six has the same percentage, but it isn’t treated the same way. Im confused. These figures could easily be replaced by red, green, blue, etc.; The fact that they are numeric values does not necessarily mean they are values to be used arithmetically.
• Sisagirl23

  

  31 July, 2010, 8:46

  great! thx again!
• thefragile900

  

  31 July, 2010, 9:26

  We can not get simpler than that.
• candoyo

  

  31 July, 2010, 10:16

  Man, you seriously need better examples. . . explain a simple concept with a complex example makes things a little difficult to suivre.Astuce: Prepare in advance. You can really improve the quality of presentations that you have a great skill. Need a little brushing. . .
• qingshuione

  

  31 July, 2010, 10:53

  Nice, thank you!
• pardes5

  

  31 July, 2010, 11:40

  great. . . . easy to learn. . . maintain. . . Thank you