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  1. K

    Mathematics: Post your doubts here!

    3 A sample of 36 data values, x, gave Σ(x − 45) = −148 and Σ(x − 45)2 = 3089. (i) Find the mean and standard deviation of the 36 values. [3] (ii) One extra data value of 29 was added to the sample. Find the standard deviation of all 37 values. how to do the second part?
  2. K

    October,November,2012 Maths Examination.

    Easy
  3. K

    Pure Maths 12 today........

    i think that i did it wrong :/ another stupid mistak T___T
  4. K

    Pure Maths 12 today........

    I dont know i substituted x=0 in equation found. then i just observed which value was nearer to the y i got but maybe i made a mistake i got 1/1/3 but someone else got 1/2/3
  5. K

    Pure Maths 12 today........

    i think that it was O nearer
  6. K

    Pure Maths 12 today........

    same! ^^
  7. K

    Pure Maths 12 today........

    For vector i did it well but i think i wrote the signs wrong T___T
  8. K

    Pure Maths 12 today........

    Curve for what? 4y=x^2?
  9. K

    Pure Maths 12 today........

    Finished but with some stupid mistakes
  10. K

    Pure Maths 12 today........

    I made so many stupid mistakes!! T___T for the area of the playgroud i think that they asked to write the minimum value of the area but i instead left it at x=15 T___T I was too hasty and did not entirely read the question
  11. K

    Pure Maths 12 today........

    but i'm not sure for the rest because i think i misread the question :/
  12. K

    Pure Maths 12 today........

    You had to make a triangle with angle 0.6 (edited) hyp=20-x opp=x
  13. K

    Pure Maths 12 today........

    wasnt it x>+1 ? k was -1
  14. K

    Pure Maths 12 today........

    the domain was f(x) (> or =) 3
  15. K

    Pure Maths 12 today........

    domain was equal or more than 1 or only more than 1 because i wrote equal or more
  16. K

    Pure Maths 12 today........

    I got 18 a=3 d=2 sum= n/2 X (first + last) 360 = n/2 X (3+3+d(n-1)) 720 = n(6+2(n-1)) 720=6n+2n^2-2n 720= 4n + 2n^2 360=2n + n^2 (n-18)(n+20)=0 n=18
  17. K

    Pure Maths 12 today........

    What was the question 11 for perimeter? was it the two lines from 1.2 and [(the arc joining the two tangents together) or (the two lines form the tangents to the origin)?]
  18. K

    Pure Maths 12 today........

    radius Radius was 20 But i'm not sure of the answers. I think that i made and error and got 34.6 for perimeter :(
  19. K

    Pure Maths 12 today........

    I did it using another method but i got k=-1 i assumed that gradient of y=(1/k)x+c was 1/k then i equated it with dy/dx of 4y=x^2 and by series of simultaneous equations i got k=-1
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