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  • Quark

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Abd-al-Karim's Achievements


Quark (2/13)



  1. I cannot get my head around the following problem: An irregular six face die is thrown and the probability that in twenty throws it will give five even numbers is twice the probability that it will give five odd numbers, i.e.: P(5 even numbers is 20 throws) =2P(5 odd numbers in 20 throws) =2P(15 even numbers in 20 throws). How many times in 10000 sets of 10 throws would you expect it to give no even number? [Hint ] I do not fully understand it I think they are looking for a rnadom variable with a binomial distribution. Also I am A bit condused by P(5 even numbers is 20 throws) is that is maybe a typo and its supposed to be "in"? Also I don't see how that could be equal to =2P(15 even numbers in 20 throws) Any help would be appreciated. Thanks in advance.
  2. Could you maybe define the axes in the first diagram that would help me understand the problem a little better.
  3. I have never come accross the term disjoint in statistics/probability theory before but rom you have said it seems to mean the same thing as mutually exclusive. If then the two sets shre not common elements and I guess one could say they are disjoint. However maybe its mean in a graphical sense because in that case it makes more sense. If you can imagine a Venn diagram of events and (each would be represented by a circle) if then the circles do not overlap or touch in any way they are apart and could be said to be disjoint as opposed to: if where and , when i guess they could be said to be joint or joined together because the circles overlap. PS I'm sorry I tried to Google some decent Venn diagrams but could'nt find any relevent ones if it still doesn't make sense let me know and i'll scan some in or something.
  4. Yes that is exactly right Thank you very much. Of course you define it in terms of the conditional probability that the son reports correctly, I tried that but I just never realised that when you do that as well. Thank you, it won't bother me any longer, I can sleep now .
  5. The man wanted water to swallow a suicide pill and the barman having seen this before takes out a gun to remind the guy of death so he leaves????????????
  6. You stated the definition for two mutually exclusive events, not independent events.
  7. I had this really easy Conditional Probability problem in class the other day but for some reason I just could not do it. I could not define the events properly and even though the answer is of no use to me now it has really been bothering me lately, so I was wondering if anyone could help me out? It went something like this: A short sighted man likes to throw a basketball at a hoop in his yard but he has rely on his son to report if he scored. The probability that he scores a goal is 0,6 and the probability that his son reports it correctly 0,8. If his son reports that the father has made a goal, what is the probability that he actually did so?
  8. I am not studying Computer Science at the moment but knowing some C++ and Virtual Basic fundamentals could come in very handy when I finish varsity. I was wondering if anyone knew of any good web resources about the two languages and/or any good books even so I could teach myself. I am not tatally new to programming since I have had a lot of exposure to Java so I know the basics about things like OOP and stuff. Actually if anyone knos any good resources about Java too, that would also be much appreciated. Thanks very much in advance.
  9. I am studying Maths at varsity and I'm doing ok in it academically but I would like to do better, I find that I lose motivation a lot because I fail to see how what I am doing relates to real life, sometimes, like how is this applied in the modern world. Applications we do in class are far and few in between so I often loose interest. I think that if I had more motivation I would do better, and I would like to know if anyone knows of any good (not too technical)books about maths specifically its development and the people involved in coming up with importnat discoveries(I find that very interesting) as well as modern applications of Maths (I'm not looking for a textbook though) ideally I am looking for somethig thats almost like a novel format. Do you know what I mean? I found that the movie "A Beautiful Mind" really got my interests up in game theory and linear algebra and think that partly because of this I did better in that section than in Calculus. This is probably because I am also studying economics. So If you know anything that might help please let me know, it would be very much appreciated. Thanks in advance for any comments .
  10. Hi I'm quite new to the forum and I have this problem in that every time I come here I first log in (naturally), then I go to a particular Forum/thread and I find I have to log in again, then I go to another topic and I have to log in again ........ and so this process repeats itself over and over again for about 5 or 6 times then it stops and everything is fine I don't get logged out for no reason. Does anyone know how I can stop this from happening , should I change my browser settings or could it be because I am using FireFox?
  11. Social Sciences/Economics and related area. We could move religion and politics there too. It would take time to take off, admitedly, but there are just not a lot of Economics forums out there so eventually it would attract a lot of new people to the forum.
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