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  1. R

    A Level Economics:

    Qamar Baloch I am just wondering in the first question of efficency dont we have to define at what point a firm may reach productive efficiency?
  2. R

    Stat v. 62

  3. R

    Stat v. 62

    va var was 16.8
  4. R

    Stat v. 62

    hmm well thats what i am confused abt in many mark schemes if you get say 7.25 they take it to be 7 while in tohers they take the one between 7th and 8th so i am hoping all thsoe are right
  5. R

    Stat v. 62

    littlecloud11 what was your upper quartile and iq? 205 and 65?
  6. R

    Stat v. 62

    i think they will cut 2 marks if you did till that but not sure though. I am not very familiar with their marking.
  7. R

    Stat v. 62

    P(445-c<X<445+c)=0.94(i think mean was 445 and s.d was 3.6 or 3.61 i think) P(445-c-445/3.61<Z<445+c-445/r)=.94 P(-c/3.61<Z<c/3.61)=.94 2P(Z<C/3.61)-1=.94 P(Z<C/3.61)=(1+.94)/2 P(Z<C/3.61)=.97 c/3.61=1.881 so c=6.79
  8. R

    Stat v. 62

    for the last question of X there was 3 possibilities 0 1 2 right?
  9. R

    Stat v. 62

    you guys the remember the value of n and k? is it 144 and 6? and abt the permutation 2nd and third is it 4!*6!*2!*3!(for no.ii) and for no.iii is it (12!-9!*4!)?
  10. R

    Stat v. 62

    hm hmm around 6.78 or something like that it was c=1.881*r(and i cant remmeber the s.d value clearly but it was around 3.61 i think)
  11. R

    Stat v. 62

    we can discuss all the answers? i remember many of them would like to know if they are correct
  12. R

    Stat v. 62

    I i got 2 outliers below Q1 and all values of 300+ in Q3 the iq range was 60-65 not sure
  13. R

    Mathematics: Post your doubts here!

    abt the Greengage one not 100% sure but its like this *R*E*E*N(GG)A*E* if you consider both g's as 1 then there is 7 letters and the starts as places where the g's can be then there are 7 slots since in one slot the 3rd g will be placed in the other gg's got 6 slots so its 7!*6/3!(for the eees)
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    A level Statistics doubt??Post your doubts here!

    profits can be eitehr -(24*20) or (450*10-24*200 which are -480 or 4020 its -480 if more than 1 firework fails to work since they get no revenue and only have the cost. From the prev question you found out the prob for failure of more than 1 firework to be 0.264 its 4020 profit when less than 1...
  15. R

    A level Statistics doubt??Post your doubts here!

    as far as i know the first can be any colour so its prob is 1 and the one after that cant be the same colour so it will be 2/3 followed by 2/3 until the rest 7 slots are filled....as a result the ans is (2/3)^7
  16. R

    A level Statistics doubt??Post your doubts here!

    12/30+13/30....this is because the initial 12 females includes the females who watch kops are kids so they meet all the criterial and so the only other criteria to meet is the men who watch kops are kids which are 13.. (12/30)+(13/30)
  17. R

    Mathematics 9709/32

    i dint get that one correct but as far as i remember ppl said b was 12 and c=-1
  18. R

    Mathematics 9709/32

    i got aroot3 buyt many also got 2a so not sure
  19. R

    Mathematics: Post your doubts here!

    upper quartile possibility is 75% so P(Z<63-51/s.d)=.75.....12=.6745sd therefore sd=17,8
  20. R

    A level Statistics doubt??Post your doubts here!

    hmm you have to understand the bell diagram Look at like this if value of z is a(which is not negative) then P(Z<a) has to be greater or equals to 0.5 and P(Z>a) has to be less/equals to 0.5 now if a is negative then P(Z<a) will be less than 0.5 and P(Z>a) will be greater than 0.5 and thats how...
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