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astonky last won the day on April 23

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About astonky

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  1. Ok thank you very much, I now managed to solve part 1. For part 2 I am slightly confused about why you need both the poisson and the binomial distribution. Would you care to explain that further?
  2. Hi, Could anyone please explain how to solve this type of question: In a ski resort, the probability of more than 3 accidents in any day at the weekend (Saturday and Sunday) is 0.24. Assuming a Poisson model, 1) Calculate the mean number of accidents per day at the weekend (Saturday and Sunday) I got to the point that P(x>3) =0.24 and P(x<3 or x=3) = 0.76. How do I continue from here? I also know that the answer is 2.49. 2) Calculate the probabilit that, in the four weekends in February, there will be more than 5 accidents during at least two of the weekends. I am completely lost as to how to approach this question. Any help (with clear explanations) is much appreciated. Thanks!
  3. I agree with @shellziess about Geography and Economics. The same holds true for Geography and Business (which I am both taking so I might be a bit biased). Economics may help you more if you're thinking about going into finance, market analysis and government policies. Economics is more of a macro-level subject, while Business focusses on the micro-level decisions that enterprises face. Business management may be more appropriate if your interests lie in marketing and entrepreneurship and you enjoy analysing the problems and opportunities a specific company faces. @SomeoneYouDon'tKnowWhether you want to or should take Psychology or not depends on what line of work you want to pursue after a business degree. Psychology is seen to be a narrower Group 3 subject by some people (I don't know whether this is true) and from what I've heard it focusses a lot on analysing different psychological studies. Take my words with a grain of salt, but I think psychology may help you in marketing topics of a business course. Though this obviously depends on the topics your school does. In conclusion, Geography may be more versatile, while Psychology may be viewed as more unique but sometimes also more restricted. If you need to make a choice, try to attend all classes of interest for the first two weeks and then make a choice (this should be possible at your school as per IB regulations).
  4. I recommend you decide on a clear cut off point each day after which you will do no more school work, and just relax, or hang out with friends (ie. do what you like).
  5. @SomeoneYouDon'tKnow I agree with @shellziess. I would not recommend you to take both HL Economics and Business Management at the same time. I would pick the subject where you think the course looks more interesting, or if your unis have a preference for one, I'd pick that one. Even though you're fairly sure you want to pursue a business degree after uni, you might enjoy some more variety and one of the two subjects should suffice for universities (in some countries Economics has a better reputation that Business management, but that depends). Maybe you want to choose a different subject from Group 3, such as Psychology or Geography, the latter being linked in some parts to the business syllabus if you take it at HL. But if you are sure you would enjoy both Economics and Business (after looking at the syllabi) you may want to stick with both subjects.
  6. Thank you so much!
  7. @kw0573 Thank you so much for your help. I haven't seen hypergeometric distributions before. I understand everything up to the last step when the final value is calculated (the substitution of variables and their logic is clear to me. But taking the first problem, how do you get from P (X =2) = ((10 --2) ( 10 --3)) / (20--5) = 0.087 ? Because if I use combinations I get a different result of around 0.34. These are the steps I did: 10 nCr 2 = 45 10 nCr 3 = 120 20 nCr 5 = 15504 45*120 /15504 = 0.348 Would you please tell me where I went wrong? Or did I completely misunderstand how to do hypergeometric distributions? Info: I did not know how to write the 10 above the 2, and so on for the binomials on this forum, so (10 --2) is supposed to stand for 10 nCr 2. The rest seems to be clear to me once I understand how to do these hypergeometric distributions.
  8. @themthem Your subject choice depends on what you want to do, which you find more interesting and which has the better teacher. I take Geography HL and Business SL (online) and I like Geography a lot more than Business. This is partly because we have a great teacher, but also because there are a lot more relevant geography websites and the theory is easy to understand. In business, I sometimes feel that the theories we study are not nearly as reliable (or used as much) as in geography. In geography, you'll learn about population change, economic and social disparities, environmental geography and whichever two options your school selects. In business, you'll learn basic finance (balance sheet, profit and loss account, profitability ratios), marketing (4Ps, etc.), human resources, and operations management. If you want to go into science/research I would recommend you take geography - the methods are similar to scientific procedures, whereas if you think about working in a company you might want to choose business. In my opinion, geography is the more versatile choice of the two.
  9. Would you mind explaining how you solved the question (ie. how you got your answer)?
  10. @somhes18 Are you writing your essay for geography? I don't know how human rights theory will fit in here, as technically speaking human rights should be the same for all people of South Africa (correct me if I'm wrong). Though I am not familiar with this topic, I think it may be easier to focus on social and economic inequality rather than considering human rights theories. As such, you may want to consider rewriting your research question to something like the following: To what extent has urban gentrification in the city of Port Elizabeth amplified social and economic inequalities? I think this would make it easier to focus your writing,as it could to be broad to focus on urban gentrification in the whole of South Africa.
  11. I can only agree with @running_on_mochas. An essay outline is really helpful. I did my Geography extended essay over the summer, so I am by no means an expert on writing English EE's but I did get some very helpful advice for any essay-based subject from my supervisor. She said it would be very good to structure each point you wish to make in the following way: -Main argument: Experiencing Christianity has XYZ effect on main character. -Evidence to back this up: (find a quote or paraphrase from the book) eg. This can be seen from the fact that author ABC (2011) states, "...." -What impact this has on the story aka Why is this important. The character's experience of Christianity is important because this is when the character begins to develop religious tolerance. Then to expand on this there are two possible approaches: (1) offer a direct counterargument using the same structure as above and then synthesise your two points to come to a mini-conclusion (2) consider an alternative point of view (ie. it may also be argued that Christianity has DEF effect on main character) using the same structure as above. hope this helps! PS: A direct counterargument that springs to my mind is the comparison of the influence of religion vs. overall personality/behaviour of other characters on the protagonist.
  12. Hi everyone, I have a math question on conditional probability that I am completely stuck on. Would you mind explaining the step by step process (and why I should do each step) to me? The question is as follows: Bag A contains 6 blue counters and 4 green counters. Bag B contains 9 blue counters and 5 green counters. A counter is drawn at random from bag A and two counters are drawn at random from bag B. Tbe counters are not replaced. Given that there are two blue counters and one green counter, what is the probability that the green counter was drawn from bag B? I have the answer, which is supposed to be 0.628, but I have no idea how to get to that point. thank you very much in advance for your help.
  13. Es porque no hay muchos alumnos: 200 en total en mi escuela, 27 en mi clase (IB1) y 11 alumnos en IB2. Y mi colegio está en una ciudad bastante pequeña (250,000 habitantes). También tenemos que considerar que los colegios públicos son todos gratuitos y en mi país muchos padres no quieren pagar 800€ al mes para que sus hijos reciben enseñanza internacional, especialmente porque la enseñanza está bien.
  14. Sí, matemáticas a nivel superior es bastante difícil, pero creo que el curso de SL es peor porque tienen un profesor que no sabe enseñar. Por eso, empezó con matemáticas HL, y me quedó en este curso porque estoy considerando estudiar geografía y algunas universidades prefieren alumnos que han estudiado matemáticas a un nivel alto. en mi escuela tenemos estos cursos: Lengua A: alemán, inglés, chino Lengua B: inglés, aleman, español Geografía (o Business Management o Economía o Psicología como curso online con Pamoja Education) Biología, física, informática (sí, es un poco extraño que no tenemos quimica) Matemáticas (SL o HL, no tenemos ni studies ni further maths) Arte Cuales de estos cursos tenéis?