Statistics S1 post your doubts here

[Kamihus]

Thankk you

Can you please name some theory questions? And just questions, I'll sort out the answers myself.

 

[hassaan10293]

THankk youu

Anytime and lol did you check out that pic??

 

[moonangel996]

Anytime and lol did you check out that pic??

noo cant find it, Kamihus gave the answer thank you

 

[moonangel996]

Can you please name some theory questions? And just questions, I'll sort out the answers myself.

yeah there is on in this paper may-june 10 variant 62 Question 1
there is another one in may-10 variant 61 Question 2(iii)
passed by these only

 

[abdul rehman 123]

you guys would be giving phys too so i was thinking to ask about indentify about variable and independent variables would be greatful

 

[abdul rehman 123]

i know its about s1 but i have to cuz its 3:29 here lol

 

[safa adil]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w13_qp_61.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w13_ms_61.pdf
Q5 i why we subtract 0.08 from 1 and then putted a negative value to z ? anyone ?

 

[sweet life]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s12_qp_62.pdf

can anyone plz help me with ques 2, the distribution table i suck in maths and i don't know this

 

[ZaqZainab]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w13_qp_61.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w13_ms_61.pdf
Q5 i why we subtract 0.08 from 1 and then putted a negative value to z ? anyone ?

here are the rules

 

[safa adil]

View attachment 43497
here are the rules

they asked 8% of carrots are shorter than c cm. Find the value of c. so why they subtracted 0.08-1 ? can u explain please

 

[ZaqZainab]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s12_qp_62.pdf

can anyone plz help me with ques 2, the distribution table i suck in maths and i don't know this

The random variable Y takes the value 0 if thetwo values of X are the same. Otherwise the value of Y is the larger value of X minus the smaller value of X
So it is 2 and 2 or 4 and 4 or 6 and 6
then y=0
now to make the table we know 0 is there for sure
then use the other information
if 2 and 4
then y=4-2 (bigger value - smaller value)
or it can be 6 and 2 there y=6-2=4
ALL the possible ways of getting y=0
2 and 2 -------> from the table above (o.5*0.5)
4 and 4 ------>(0.4*0.4)
6 and 6 ------->(0.1*0.1)
add all this up you will get 21/50
ALL the possible ways you can get y=2
2 and 4 -----> (0.5*0.4)
4 and 2 ------>(0.4*0.5)
6 and 4 ------>(0.1*0.4)
4 and 6 ------>(0.4*0.1)
add all this up you get 12/25
ALL the possible ways of getting y=4
6 and 2 ------->(0.1*0.5)
2 and 6--------->(0.5*0.1)
add this up and you get 2/20
now making the table y 0 2 4
p(Y=y) 21/50 12/25 2/20

 

[ZaqZainab]

they asked 8% of carrots are shorter than c cm. Find the value of c. so why they subtracted 0.08-1 ? can u explain please

p(x<c)= 0.08
p(z<((c-14.2)/3.6)=0.08
ϕ((c-14.2)/3.6)=0.08
BUT if you see the table you cant find 0.08 and so you have to do 0.08-1
and then the z value you get from 0.08-1 you will add a negative sigh to it
You know you are having an exam in less than 10 hours you should know this my dear

 

[safa adil]

p(x<c)= 0.08
p(z<((c-14.2)/3.6)=0.08
ϕ((c-14.2)/3.6)=0.08
BUT if you see the table you cant find 0.08 and so you have to do 0.08-1
and then the z value you get from 0.08-1 you will add a negative sigh to it
You know you are having an exam in less than 10 hours you should know this my dear

ok thank u so much hope we all get the grades we wish

 

[ZaqZainab]

ok thank u so much hope we all get the grades we wish

got something else you need help with i am free right now

 

[safa adil]

got something else you need help with i am free right now

do u have any notes or advise about combination and permutation ?

 

[ZaqZainab]

do u have any notes or advise about combination and permutation ?

the only notes i have of S1

 

[sweet life]

thank you

The random variable Y takes the value 0 if thetwo values of X are the same. Otherwise the value of Y is the larger value of X minus the smaller value of X
So it is 2 and 2 or 4 and 4 or 6 and 6
then y=0
now to make the table we know 0 is there for sure
then use the other information
if 2 and 4
then y=4-2 (bigger value - smaller value)
or it can be 6 and 2 there y=6-2=4
ALL the possible ways of getting y=0
2 and 2 -------> from the table above (o.5*0.5)
4 and 4 ------>(0.4*0.4)
6 and 6 ------->(0.1*0.1)
add all this up you will get 21/50
ALL the possible ways you can get y=2
2 and 4 -----> (0.5*0.4)
4 and 2 ------>(0.4*0.5)
6 and 4 ------>(0.1*0.4)
4 and 6 ------>(0.4*0.1)
add all this up you get 12/25
ALL the possible ways of getting y=4
6 and 2 ------->(0.1*0.5)
2 and 6--------->(0.5*0.1)
add this up and you get 2/20
now making the table y 0 2 4
p(Y=y) 21/50 12/25 2/20

 

[ZaqZainab]

do u have any notes or advise about combination and permutation ?

Permutation (arrangements)
order of objects is important
the number of ways of arranging 'n' unlike objects in a line is n!
the number of 'n' objects if p are alike then number of arrangements=n!/p!
the number of ways of arranging n unlike objects in a circle is (n-1)!
the number of arrangements of 3 objects taken from n unlike objects nPr=n!/(n-r)!

 

[hassaan10293]

Gonna do my exam in a few hours!!! When I finish I'll give you on idea on how tough/easy the paper is!

 

[Princess1997]

Gonna do my exam in a few hours!!! When I finish I'll give you on idea on how tough/easy the paper is!

Good Luck