A level Statistics doubt??Post your doubts here!

[walidbinkhalid]

i need help with Q2 probability distribution table! http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s12_qp_62.pdf

 

[syed1995]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_61.pdf
Q5a...... want a simplified calculation... it is taking more than a page... my maths senses arent working

DA HELL.. that question would take a lot of working.. would deffo increase 1 page.. if you get a shorter working tag me!

 

[syed1995]

syed1995

yea?

 

[Alice123]

yea?

https://www.xtremepapers.com/community/attachments/img_20130521_141556-jpg.27185/
sorry bout dat... net connection prob

 

[syed1995]

P(X > 2µ) = 0.1016


3µ = 7σ^2
µ = 7/3σ^2

P(X>2u)
P(X>2u-u/SD)
P(z>u/SD)
P(z>(7 SD^2/3 / SD) =0.1016
P(z>7/3 * SD)=0.1016
z<-(7SD/3 )=-invPhi(1-0.1016)
7SD/3 = invPhi(0.8984)
SD = 3*invPhi(0.8984) / 7

Now Mean will be (7*(SD)^2)/3

 

[syed1995]

https://www.xtremepapers.com/community/attachments/img_20130521_141556-jpg.27185/
sorry bout dat... net connection prob

THANKS alot for that!

 

[A star]

THANKS alot for that!

u douldnt do it
i figured it out

 

[A star]

thanks
PS your signature is giving me a severe headache
A star

 

[Anika Raisa]

i need help with Q2 probability distribution table! http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s12_qp_62.pdf

Xcuse my handwriting! Hope it helps!!!

 

[jjtheslayer]

So, anyone doing p6 tomorrow? :s

 

[syed1995]

u douldnt do it
i figured it out

My method was very long. but I solved it though.

 

[A star]

My method was very long. but I solved it though.

long method means more time consumption it just leaves less time for other mind draining tasks

 

[syed1995]

long method means more time consumption it just leaves less time for other mind draining tasks

naw .. not really it just consumes pages for me.. I just hope in the main paper I don't find the time short to solve all the questions!

My target has always been 1 hour for S1. but hardly meet that target AND PLEASE PLEASE.. NO PLOTTING OF GRAPHS in the coming paper.. -,- especially the CF.

 

[abruzzi]

sorry for bad handwriting. .

Thank you

And yeah.. your handwriting is better than mine

 

[A star]

naw .. not really it just consumes pages for me.. I just hope in the main paper I don't find the time short to solve all the questions!

My target has always been 1 hour for S1. but hardly meet that target AND PLEASE PLEASE.. NO PLOTTING OF GRAPHS in the coming paper.. -,- especially the CF.

cF rocks but if it doesnt then they will give another question that will make me mad

 

[syed1995]

cF rocks but if it doesnt then they will give another question that will make me mad

if we have to draw cfc in paper.. then you're dead for sure!

 

[A star]

if we have to draw cfc in paper.. then you're dead for sure!

tit for tat

 

[syed1995]

tit for tat

haha...

 

[Mecd66]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w11_qp_62.pdf
Question 7)ii)
if somebody can please explain this to me please.

 

[Anika Raisa]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w12_qp_61.pdf
( Q7 - c part ) I don't get it at all . brain not working ! please help me
Jiyad Ahsan

9 diff fruit pies
3 ppl ---- all gets odd no.

List of odd no. 1 3 5 7 _(9 not possible otherwise all will not get pies!)

Now , lets list possible ways the no. can be divided

1st per 2nd per 3rd per

1 3 5

1 5 3

1 7 1

7 1 1

1 1 7

3 1 5

3 3 3


(See that all combinations add to 9)

Now u c ms says:


1 1 7 = 9C1× 8C1× 7C7 (oe)× 3C1 =216 In above table:here c only 1 out of the three cn get 7 pies so 3C1.
1 3 5 = 9C1× 8C3× 5C5(oe)× 3! = 3024 In above table:here c either can hv 5 or 3 or 1 pie in any order so 3!
3 3 3 = 9C3× 6C3× 3C3 (oe) = 1680
In above table:here c its all getting 3 pie n order doesnt matter!
so you add all n get d final ans!
Hope i cud xplain! Though i myself is not much clear abt y we use 3C1 instd of 3! in the first part ...Bt dat was d explanation we were told @class . A little help there with this Alice123 or syed1995 ASTAR or any1!