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  1. Eugene99

    Winter 2015 papers er

    Using the equations of half reactions, we have: 5(Sn2+ --> Sn4+ + 2e-) 2(8H+ + MnO4^- + 5e- --> Mn2+ + 4H2O) ------------------------ -------------------------- ----------------- 16H+ + 5Sn2+ + 2MnO4^- --> 5Sn4+ + 2Mn2+ + 8H2O No. of mol of SnCl2 = 9.5/190 = 0.05 mol using the ratio 2:5 from...
  2. Eugene99

    Physics: Post your doubts here!

    I understand...and I think I'm better interested in Physics than in chemistry! Chemistry is just a helll!! which subs are you taking?
  3. Eugene99

    Physics: Post your doubts here!

    Is Physics harder than Chemistry? I'll be taking AS Physics in Nov of 2016, since I'm taking AS Chemistry, Biology and Mathematics this summer, I was wondering whether I'll find Physics even harder than Chemistry or is it better than that?
  4. Eugene99

    A' Level Registrations for May/June 2016

    Did anybody get the provisional statement? ... I didn't! Hasn't it been a long time?
  5. Eugene99

    Chemistry: Post your doubts here!

  6. Eugene99

    Time is slipping away as though someone has bewitched the clocks to go extra fast #ExamsLoomingUp

    Time is slipping away as though someone has bewitched the clocks to go extra fast #ExamsLoomingUp
  7. Eugene99

    Statistical Inference

    Question 37: binom dist with n = 12, p = 0.45, q = 0.55 E[x] = np = 12*0.45 = 5.4 <------ ans to part 1 08 C(12,08) * 0.45^08 * 0.55^4 0.07616 -----> 0.0762 (ans to part 2) 09 C(12,09) * 0.45^09 * 0.55^3 0.02770 10 C(12,10) * 0.45^10 * 0.55^2 0.00680 11 C(12,11) * 0.45^11 * 0.55^1 0.00101...
  8. Eugene99

    Statistical Inference

    Question 50: a) n= 200 ; p = 0.015 (defective) ; q = 0.895 (not defective) 1. None of the antennas is defective. P(200 not defective) = 0.895^200 = 2.315.10^-10 b) Three or more of the antennas are defective P(3<= x <=200) = 1 - P(0<= x <= 2) = 1 - binomcdf(200,0.015,2) = 0.5785 Question...
  9. Eugene99

    Statistical Inference

    Question 45: Choosing 2 people from the 6 that liked the new flavor and 2 people from the 4 that did not. This can be done in C(6,2) * C(4,2) = 15*6 = 90 ways. Now since there are C(10,4) = 210 ways we can pick 4 of the 10 people in the group without restrictions, the desired probability is...
  10. Eugene99

    Statistical Inference

    Question 42: a) How many of these new cardholders would you expect to default? What is the standard deviation? µ = 12 * (0.07) = 0.84 σ = sqrt[(12) * (0.07) * (0.93)] = 0.8839 b) What is the likelihood that NONE of the cardholders will default? 0.4186, found by (12!/(0! * 12!)) *(0 .07)^0 *...
  11. Eugene99

    Statistical Inference

    is difficlt then, because I work backwards :D but post the answers, I will try
  12. Eugene99

    Statistical Inference

    do you have the answers?
  13. Eugene99

    A' Level Registrations for May/June 2016

    Just got the confirmation...the payment status on the site also shows 'paid' now.. what about you guys?
  14. Eugene99

    Islamabad Distinctions

    so what does this 'best across 9 O'Levels' mean?
  15. Eugene99

    Islamabad Distinctions

    OH WOW!!!! coool.... (y)Congratz!
  16. Eugene99

    Islamabad Distinctions

    you got one? that Rizwan javed in Urdu is you?
  17. Eugene99

    Mathematics: Post your doubts here!

    When we solve questions in trigonometry, should we answer in radians or degrees..or are both acceptable?
  18. Eugene99

    all cie full textbooks available in pdf format

    Wow! Man you did an amazing work!
  19. Eugene99

    Mathematics: Post your doubts here!

    Right! Got it!
  20. Eugene99

    Mathematics: Post your doubts here!

    oooohh right! so when cos Θ = 0, Θ = 90...didn't focus there! thanks again
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