Statistics S1 post your doubts here

[ZaqZainab]

by which formula u got this result ? why its not LQ=520 and UQ = 690 ?

51+1/4 for LQ
and (51+1)*3/4 UQ

 

[omaaaar]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_S08_qp_06.pdf
Q6 part two how to get each probability with brief explanation

 

[moonangel996]

You are finding the probability where all are separated but we have to find where all are not together. This can be done: All possible - All vowels together
For together: 8! × 4/2!2!=40320
Subtract this from the total ways.
7C2 or 7C1 cannot be used as 2 or 3 E's are already chosen so remaing are 4 not 7.
When 2 are chosen, it will be 4C2 for remaining are 4C1 when all 3 E's are chosen.

What is the difference between separated and not together ?? no difference
noo they are choosing 4 letters from all and 2 are already there from the four ??
I am not convinced with what u said can u explain more ???
Thankss

 

[Kamihus]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_S08_qp_06.pdf
Q6 part two how to get each probability with brief explanation

0 will be when it will be answered in first attempt which is 1/2.
2 when are 2 unanswered and 1 answered so (1/2)^2*1/2.
3 when are 3 unanswered and 1 answered so (1/2)^3*1/2.
4 when are 4 unanswered and 0 answered so (1/2)^4.

 

[omaaaar]

0 will be when it will be answered in first attempt which is 1/2.
2 when are 2 unanswered and 1 answered so (1/2)^2*1/2.
3 when are 3 unanswered and 1 answered so (1/2)^3*1/2.
4 when are 4 unanswered and 0 answered so (1/2)^4.

Thanks got it was confused bcz didnot think of the prob of being answered

 

[Kamihus]

What is the difference between separated and not together ?? no difference
noo they are choosing 4 letters from all and 2 are already there from the four ??
I am not convinced with what u said can u explain more ???
Thankss

NOT ALL next means there can also be 2 or 3 together, whereas you are finding where all are completely separated.
When 2 E's are chosen, 2 are already there. Now we have to choose rest of 2 from the 4 which are not E's
When 3 E's are chosen, only 1 has to be chosen from the rest of 4.

 

[zaidwaseem]

9708/0/N/11 62 Q6 part ii... Plz help

 

[omaaaar]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_S08_qp_06.pdf
Q3 part one should we divide the total by the no. of repetitions bcz in the ms they have not can u tell why did they not divide

 

[Kamihus]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s10_qp_61.pdf
Q6 (ii) What if plastic mugs were separated instead of the china mugs? Anyone? ZaqZainab

 

[Kamihus]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_62.pdf

Q4 iv) can anyone PLEASE explain why we will use frequencies on xaxis

We don't, weight is on the x-axis and frequency density on the y-axis.

 

[moonangel996]

NOT ALL next means there can also be 2 or 3 together, whereas you are finding where all are completely separated.
When 2 E's are chosen, 2 are already there. Now we have to choose rest of 2 from the 4 which are not E's
When 3 E's are chosen, only 1 has to be chosen from the rest of 4.

ohhh okaaaii ,Thank youu alooot
I think your mad of me sorry

 

[Kamihus]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_S08_qp_06.pdf
Q3 part one should we divide the total by the no. of repetitions bcz in the ms they have not can u tell why did they not divide

We divide when items are identical but here it is mentioned that they are different.

 

[_Ahmad]

We don't, weight is on the x-axis and frequency density on the y-axis.

yea
sorry i didn't see the ms properly

 

[Kamihus]

ohhh okaaaii ,Thank youu alooot
I think your mad of me sorry

Its completely Ok. Glad to help

 

[Kamihus]

ohhh okaaaii ,Thank youu alooot
I think your mad of me sorry

Do you have any idea of the query I posted above?

 

[moonangel996]

Do you have any idea of the query I posted above?

No what is it ??

 

[hassaan10293]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w10_qp_63.pdf

6th Question!! Please can you reply fast! cause I have mine tomorrow and thank you!!!

 

[moonangel996]

No what is it ??

okkaii i will try it now

 

[SitiPutri]

You are finding the probability where all are separated but we have to find where all are not together. This can be done: All possible - All vowels together
For together: 8! × 4/2!2!=40320
Subtract this from the total ways.
7C2 or 7C1 cannot be used as 2 or 3 E's are already chosen so remaing are 4 not 7.
When 2 are chosen, it will be 4C2 for remaining are 4C1 when all 3 E's are chosen.

Could you please explain me why it is 8! x 4/2!2! instead of 8! x 4!/3!? Thank you!

 

[ZaqZainab]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_qp_61.pdf
Q6 (ii) What if plastic mugs were separated instead of the china mugs? Anyone? ZaqZainab

why do you wanna do that
No it can't be
you have 4 china and 6 plastic
you can't even find them all separated
Plastic China Plastic china plastic china plastic China plastic
now where will the last plastic cup go?
so no
even if you had a question which you could do that why would you wanna do that?