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  1. A

    A level Statistics doubt??Post your doubts here!

    Im sorry I meant 75% lies above the LOWER quartile :P
  2. A

    A level Statistics doubt??Post your doubts here!

    For a normal distribution, 75% data lies below the upper quartile, 75% lies above the lower quartile and 50% lies in the interquartile range. Use any one of the resulting eqs and ull get the answer :) P(X<63)= 0.75 P(X>39)= 0.75 P(39<X<63)= .5
  3. A

    A level Statistics doubt??Post your doubts here!

    Theres no clue .. I mean its part of the working. You dont HAVE to do any extra working to get .97, it jut comes. If you know what i mean.
  4. A

    A level Statistics doubt??Post your doubts here!

    It IS .97.. but later on.. see the q starts the same way as your previous q. So I think you wont mind if I jump to P(-a< Z < a) = .94 2*Fi(a) - 1= .94 Fi(a) = .97 I think its THIS .97 that they are referring to.. since taking .97 at the start does not lead to the right answer..
  5. A

    A level Statistics doubt??Post your doubts here!

    What exactly troubles you in this q? Its simple :) P(X<0) giving you P(Z<(0-u)/2u)) i.e P=(Z<-0.5) Now solve it like any other q :)
  6. A

    A level Statistics doubt??Post your doubts here!

    I'm not sure if your problem has already been addressed, but your question is too interesting to resist ;) So here goes.. Symmetrical limits means that both the values, let them be x and y are the same distance from the mean. That means x-mean and y-mean are the same but with opposite signs...
  7. A

    Mathematics: Post your doubts here!

    For c.f curves, what is the median??? (n+1)/2 th term or the n/2th term?
  8. A

    AS BIOLOGY P-33

    it was okay.. Alhamdulillah :)
  9. A

    Mathematics: Post your doubts here!

    Yes you are.. for your first q, let me give you the main idea. If you still have trouble solving it, ill post the whole working :) more than an s.d from the mean means: P(X<mean-s.d) + P(X>mean+s.d).. youll get the probability. Since expected number is no of trials x probability.. youll multiply...
  10. A

    Mathematics: Post your doubts here!

    In p6 when scaling variables.. rq when the give u (x-50)^2 and ask you to calculate s.d of x... what formula do we use? S.dy = aS.dx or S.dy = |a|S.dx where a is x's coefficient and y is x-50..
  11. A

    AS BIOLOGY P-33

    Oh han me AS k point of view se keh rai thee... Chalo, all the best for P4! :)
  12. A

    AS BIOLOGY P-33

    all ive read is just a few drops.. not the exact number..
  13. A

    AS BIOLOGY P-33

    Haha i know that.. He exaggerated a little.. But chalo saray din ki itni khap k baad C to aa jae ga na.. if not an A (IA) :)
  14. A

    AS BIOLOGY P-33

    Not as good as my expectations :P lol not that im relaxed about the remaining papers or anything, but with only hours left before the paper, theres not much u can prepare, not much u can do except for telling yourself to calm down, so yeah.. :)
  15. A

    AS BIOLOGY P-33

    P2 was the main paper.. jo hona tha ho to gya he.. :D IA,IA :)
  16. A

    AS BIOLOGY P-33

    For this diagram..what exactly is the guard cell? I mean does it include the yellow region surrounding each pair of guard cells??
  17. A

    AS BIOLOGY P-33

    Our teacher always says : Beta P1,2 acha kar lou, P3 me U b aa jae jo final grade A ay jae ga.. Thats what i keep telling myself to stay calm :D Anyways, all the best everybody! Lets hope the practical goes easy on us.. :)
  18. A

    AS BIOLOGY P-33

    those are for monocod plants
  19. A

    AS BIOLOGY P-33

    Somebody posted this in some other thread a few months ago..dont know who.. this might help clear many confusions regarding food tests and microscopy :)
  20. A

    AS BIOLOGY P-33

    Low and high power plan diagrams
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