Paper 12 maths

[gadagada]

anybody for as level statistics here.

i am doing statistics, it's on the 24th of may

 

[Thampi4]

i'll take that as a no >.<

i got 19.5

 

[cheesww]

i am doing statistics, it's on the 24th of may

i need help n permutation nd combination !!

 

[user]

i need help n permutation nd combination !!

check out the first post of the maths doubts thread...links given for explanation..of that

 

[gadagada]

i need help n permutation and combination !!

Well, first, check out these links to get a brief idea about the difference between permutations and combinations.
http://www.mathsisfun.com/combinatorics/combinations-permutations.html

http://www.s-cool.co.uk/a-level/maths/probability/revise-it/permutations-and-combinations

And, then go through your textbook, or revision guide. But mostly, focus on past papers, and try to solve as much as you can. Practice, practice, and practice. You still have time, don't worry.

I also attached some notes, you might want to check out.

Hope I helped, and good luck!

 

[cheesww]

Well, first, check out these links to get a brief idea about the difference between permutations and combinations.
http://www.mathsisfun.com/combinatorics/combinations-permutations.html

http://www.s-cool.co.uk/a-level/maths/probability/revise-it/permutations-and-combinations

And, then go through your textbook, or revision guide. But mostly, focus on past papers, and try to solve as much as you can. Practice, practice, and practice. You still have time, don't worry.

I also attached some notes, you might want to check out.

Hope I helped, and good luck!

Thank YU so MUUUCHH !!

 

[gadagada]

Thank YU so MUUUCHH !!

My pleasure.

 

[gadagada]

@ skanky631

May/June 2009 P6
Q1. (i) First, arrange the words of the question into an equation.
P(X>1002)=225/900
P(X>1002)=0.25
1- P(X<1002)= 0.75
By using the z-table, when p= 0.75, z= 0.674
So, P(Z<0.674)=0.75

Z=X-mew/s.d
0.674=1002-mew/8
8*0.674=1002-mew
5.392=1002-mew
Therefore, mew = 996.608 ~997

(ii)Now, consider this a normal probability question without replacement.

So, P(2)=225/900 * (224)/(899) * ( 899-224)/898
=3 {225/900 * 224/899 * 675/898}
= 0.140
Finally multiply by 3, because there are 3 ways to arrange getting 1002 twice in three times (3!/2!)

Hope I helped!

 

[shanky631]

@ skanky631

May/June 2009 P6
Q1. (i) First, arrange the words of the question into an equation.
P(X>1002)=225/900
P(X>1002)=0.25
1- P(X<1002)= 0.75
By using the z-table, when p= 0.75, z= 0.674
So, P(Z<0.674)=0.75

Z=X-mew/s.d
0.674=1002-mew/8
8*0.674=1002-mew
5.392=1002-mew
Therefore, mew = 996.608 ~997

(ii)Now, consider this a normal probability question without replacement.

So, P(2)=225/900 * (224)/(899) * ( 899-224)/898
=3 {225/900 * 224/899 * 675/898}
= 0.140
Finally multiply by 3, because there are 3 ways to arrange getting 1002 twice in three times (3!/2!)

Hope I helped!

Hey. thnx a lot. you have really helped a lot.

 

[Taimoor93]

i got 0 and 64/9. ????

Yup i also got 0 and 64/9...

 

[Taimoor93]

???????????????????????????????

i got 27

 

[leosco1995]

I think we should discuss S1 in some other thread, no? Also, here are all the answers (to my knowledge)

Q1) Volume = 12 pi
Q2) 0.105
Q3) a = +5
Q4) Length CD = 2.5 units.
Q5) 45 and 116.6 degrees.
Q6) I don't remember exactly but I think the perimeter was 45.x (or something like that) and the area was 146 cm^2.
Q7) (i) a = 9 and d = 2, (ii) a = 27
Q8) 1/root(61) * (-5i + 6j)
Q9) A (4,6), B (2,2) and area = 9.33 units
Q10) 0 < k < 64/9

 

[Starry_night]

what was the answer for the vector question where you had to find the angle between the two vectors??

 

[nabilnms]

does any one remember the sequence question from P1 v2????
and i really wanna know the answers you guys got for that....
i got a=9 and d=2 for arithmatic progression
and got a=81 in GP.....
plz lemme know asap!!!!
cuz i left 19 marks in p32. i really worried about it!!!

 

[leosco1995]

I just posted all of the answers for variant 12. The answer to the GP was 27.

 

[ibadsiddiqi]

does any one remember the sequence question from P1 v2????
and i really wanna know the answers you guys got for that....
i got a=9 and d=2 for arithmatic progression
and got a=81 in GP.....
plz lemme know asap!!!!
cuz i left 19 marks in p32. i really worried about it!!!

Your answers for the arithmetic progression are correct. However in the geometric progression, a=27

 

[mukki]

i got 0 and 64/9. ????

64/9 it is.

 

[angelicsuccubus]

I think we should discuss S1 in some other thread, no? Also, here are all the answers (to my knowledge)

Q1) Volume = 12 pi
Q2) 0.105
Q3) a = +5
Q4) Length CD = 2.5 units.
Q5) 45 and 116.6 degrees.
Q6) I don't remember exactly but I think the perimeter was 45.x (or something like that) and the area was 146 cm^2.
Q7) (i) a = 9 and d = 2, (ii) a = 27
Q8) 1/root(61) * (-5i + 6j)
Q9) A (4,6), B (2,2) and area = 9.33 units
Q10) 0 < k < 64/9

for q6.. I reread and misinterpretef the question, so I crossed out 45... and 146, will they mark my wrong answers? =[

 

[fathimaash]

for q6.. I reread and misinterpretef the question, so I crossed out 45... and 146, will they mark my wrong answers? =[

ya i think dey myt consider it

 

[angelicsuccubus]

ya i think dey myt consider it

I really hope so.. cause m1 went horribly and so did p3