Mathematics paper 6 (Stats)

[sma786]

Who's giving paper 6 this year?
I need some doubt clearance !

 

[junaidj]

meee
buuut we can discuss that in the mathematics section...i guess

 

[sma786]

junaidj no one replies for stats there

 

[raysonzaffar]

I can help but without Perms combs , graphs and coding

 

[syed1995]

Me as well.. I can help with questions.. just tag me in a post and I will try my best to help

 

[sma786]

syed1995 i need to know where in normal distribution, do we have to do 1-ans

 

[iFuz]

syed1995 i need to know where in normal distribution, do we have to do 1-ans

In normal distribution you should have
i) Z < *****

where ***** is POSITIVE number and sign between Z and Number is of smaller than. If its not, then we will subtract answer from 1.

 

[sma786]

In normal distribution you should have
i) Z < *****

where ***** is POSITIVE number and sign between Z and Number is of smaller than. If its not, then we will subtract answer from 1.

got it

 

[sma786]

Find the number of different ways that the 9 letters of the word HAPPINESS can be arranged in
a line.
in the markscheme, it dosent allow 9!/2!*2!

(Answer: 90720)

 

[raysonzaffar]

Find the number of different ways that the 9 letters of the word HAPPINESS can be arranged in
a line.
in the markscheme, it dosent allow 9!/2!*2!

(Answer: 90720)

What ?? .... it has to be 9!/2!*2!

 

[sma786]

yup, but see the ms says not this.. look
http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s11_ms_62.pdf
Question 4, (i)

 

[raysonzaffar]

yup, but see the ms says not this.. look
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_ms_62.pdf
Question 4, (i)

This means that your final answer must be the given value instead of the calculation given . There is not 1 other way u could possibly solve this question

 

[sma786]

This means that your final answer must be the given value instead of the calculation given . There is not 1 other way u could possibly solve this question

ohk yeah point, i spent like an hour trying to do it the other way thanks!

 

[sma786]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s11_qp_62.pdf
Question 6, (i), in the markscheme, why did they take z as -1.282?
shouldn't we take the value for 0.1 as it says 10% ?

 

[iFuz]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_62.pdf
Question 6, (i), in the markscheme, why did they take z as -1.282?
shouldn't we take the value for 0.1 as it says 10% ?

Do you know how to change P(X < ****) to P(Z < ***) ?

 

[junaidj]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_62.pdf
Question 6, (i), in the markscheme, why did they take z as -1.282?
shouldn't we take the value for 0.1 as it says 10% ?

Z=X-Mean/Standard deviation
P(X<20)=0.1
we will take 0.9(since 0.1 isnt in the table)
and take it negative
so Z=-1.281
therefore: -1.281=20-mean/√0.8
mean=21
PS:i memorize the negative stuff by checking the sides of the inequality
for e.g P(X<20)=0.1
since 0.1 is less than 0.5 ,we are gonna give it the less than sign which is <,and so is the P(X<20)
so whenever they are same,its gonna be negative,opposite means Z will be positive
< < =negative (this Q)
> >=negative (P(X>20)=0.7)
< >=Positive (P(X<20)=0.7)
> <=positive (P(X>20)=0.4)
but then again,if you can memorize/understand the manual method,thats better

 

[Champ101]

Find the number of different ways that the 9 letters of the word HAPPINESS can be arranged in
a line.
in the markscheme, it dosent allow 9!/2!*2!

(Answer: 90720)

Hey guys take a closer look it says B1 9!/2!2!
And B means = Mark for a correct result or statement independent of method marks.

 

[Sarah_3420]

am i the only one who finds permutation and combination ANNOYING and HARD !

 

[junaidj]

am i the only one who finds permutation and combination ANNOYING and HARD !

nope,you're not

 

[sufyanalizaib]

amm too finding it hard...notES on permutation will be appriciated