Mathematics: Post your doubts here!

[Khan_971]

i dont get itt.. :'(
i think i have problem in the basic concept of applying these factorials and permutations and combinations.. :/

Its gonna be tough writing here. I suggest khanacademy.org or your teacher

 

[hm12]

http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_w03_qp_6.pdf
please someone explain question 4 please

 

[leadingguy]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w09_qp_61.pdf
http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w09_ms_61.pdf

qstn 3 part i)

100 -100/7 = 0 so frm where this o.5 came????

 

[Esme]

Plz explain why the ans for (i) is 10C1+10C3+10C5+10C7+10C9. i knw they said 'odd numbr' of cups but whats the mathematical logic/reason behind it ??View attachment 10571

help me with this plzzz

 

[sea_princess]

u know that 0.028 = 0.85r -.82q
the possible values of r is 2 or 3 and for q 3 or 4. try each value for both and ul realize that r=4 and q=2 for the iqr to be 0.028

thanx , so it is just by trial, I mean we don't solve equations or anything?

 

[Mattman]

No.4 http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s05_qp_6.pdf

What is the accepted way by CIE to find the upper and lower quartile with an even number of terms?
i got 5.4 for LQ and UQ 8.35 according to my teacher's method...but the marking scheme showed 8.3 and 5.4

bump

 

[Wanzi21]

need to clear my doubt.. when is the time to use lower/upper boundary in normal distribution?? for instance mean=20 P(x>18)
when to standardize I often see like this Z=(18.5-20)/(standard deviation.. hmmm

 

[mominzahid]

Its gonna be tough writing here. I suggest khanacademy.org or your teacher

cant expect much from my teacher i dont get him.. :/
saw khan academy videos they were a bit helpful.. i'll try again.. thanks for ur help..

 

[omar hazem]

need to clear my confusion please....when exaclty we use the continuity correction in S1 problems like for example in nov 06 question 5)ii) the mark scheme used the 10 as it is without cc but in june 2011 63 question 5)iii) the mark scheme used the cc......please can u help me in this??

 

[Khan_971]

need to clear my doubt.. when is the time to use lower/upper boundary in normal distribution?? for instance mean=20 P(x>18)
when to standardize I often see like this Z=(18.5-20)/(standard deviation.. hmmm

Usually there's the phrase USE a Suitable approximation

 

[Khan_971]

help me with this plzzz

See. 2 people getting odd numbers froma total of 10 mugs
1st person is who we'll deal with:
can get 1 ,3 ,5 ,7 ,9
Possibilities: 10C1, 10C3, 10C5, 10C7, 10C9
add them up to get total arrangements.

 

[omar hazem]

Usually there's the phrase USE a Suitable approximation

sometimes like june 11 63 they don't say this but in the ms they use cc

 

[smartangel]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s11_qp_63.pdf
Q3 iii..can someone tell me how exactly do we get midpoints?

 

[smartangel]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s11_qp_63.pdf
Q6...plzzzz

 

[mukki]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w09_qp_61.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w09_ms_61.pdf

qstn 3 part i)

100 -100/7 = 0 so frm where this o.5 came????

O 0 is 0.5

 

[hassam]

LAST PRT (V)

 

[Wanzi21]

Usually there's the phrase USE a Suitable approximation

now it has cleared my doubt.. I think lol
thanks

 

[ppaayas]

Does anybody here have a Statistics ebook they would not mind sharing? Please? Please?

 

[Khan_971]

need to clear my confusion please....when exaclty we use the continuity correction in S1 problems like for example in nov 06 question 5)ii) the mark scheme used the 10 as it is without cc but in june 2011 63 question 5)iii) the mark scheme used the cc......please can u help me in this??

CC usually kicks in when theres a ≥ or <= of some value. when theres 'at least' or 'should not be greater than'

 

[omar hazem]

CC usually kicks in when theres a ≥ or <= of some value. when theres 'at least' or 'should not be greater than'

is it always like this??