Mathematics: Post your doubts here!

[mukki]

so generally i have to use cc when n is a large number and p is not too far from 0.5 so when can i know when to use the normal distribution without cc??

itl be written in the qs that X follows a normal distribution or X-N
and i didnt get what u mean by p is not too far from 0.5...............Just check if np or nq >5

 

[mominzahid]

can some please please explain the 2nd part?
how do we calculate the number of combinations for both albert and tracy to be on the committee?

 

[user]

sorry for the late reply dude but first here you have to use normal to calculate the probability
P(x>32.4865)
26.4+1.645(3.7)=32.4865
once u have standardized ul find the probability of very slow which is 0.05 use binomial then and ur done

the thing is i dont get the probability as 0.05
can u show me how?

 

[lavanyamane]

can some please please explain the 2nd part?
how do we calculate the number of combinations for both albert and tracy to be on the committee?

I'm stuck on this one too

 

[mominzahid]

I'm stuck on this one too

Im so gonna flunk tomorrows exam.. :'(
i suck at perms/combs.. :/

 

[mukki]

I have a couple of doubts in stats 1:
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_63.pdf - Q.2(i) What do they mean by 'or both'? I can work out either female of watches the show, but what's "or both"?
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_62.pdf - Q.7(iv)

for s11 qp 62
the second choice of cards means P(0,4)=P(0)*P(4)
P(4)=p(5,9)*2+p(4.8)*2

 

[mukki]

I have a couple of doubts in stats 1:
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_63.pdf - Q.2(i) What do they mean by 'or both'? I can work out either female of watches the show, but what's "or both"?
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_62.pdf - Q.7(iv)

for w11

watches "Kops and kids " can either be: 1- a male who watches it >>> probability : 13/30 ( total number of students is 30)
2- a female who watches it >>>> probability 3/ 30
then there are probability of females, but since u already considered the females who watch the show , then here take those who don't watch the show , so the probability becomes 9/30
add them all and u get the required probability in the question​

 

[leosco1995]

can some please please explain the 2nd part?
how do we calculate the number of combinations for both albert and tracy to be on the committee?

I believe I explained this to someone else a week or two ago.. check this out.

 

[lavanyamane]

Im so gonna flunk tomorrows exam.. :'(
i suck at perms/combs.. :/

I was terrible at them too! But there are some amazing videos on examsolutions.co.uk You should check them out, I understood everything perfectly and I rarely get stuck on permutations and combinations any more!

 

[mominzahid]

I believe I explained this to someone else a week or two ago.. check this out.

I dont understand it.. :$
can u please explain just this basic concept to me that ur applying in part 2 and 3?

 

[Hehehaha]

Hey, can someone please help me solve this question

1(i) of this paper
http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_s09_qp_6.pdf

 

[mominzahid]

I was terrible at them too! But there are some amazing videos on examsolutions.co.uk You should check them out, I understood everything perfectly and I rarely get stuck on permutations and combinations any more!

Ahaan.. thanks.. i watched khan academy's videos on youtube they didnt help much.. :/
thanks for the tip will check them right now.

 

[hassam]

cn smone anser that GREENGAGE question of mine........?
wats the problem in my soln......8!/3! - 7!/3!

 

[redapple20]

Best of luk evry1 giving stats1! 1 suggestion especially if have problems managing time!
Like me DONT read the whole ppr before starting to attempt it wastes time!

 

[leosco1995]

cn smone anser that GREENGAGE question of mine........?
wats the problem in my soln......8!/3! - 7!/3!

Post the exact question here, maybe I can help.

 

[user]

Best of luk evry1 giving stats1! 1 suggestion especially if have problems managing time!
Like me DONT read the whole ppr before starting to attempt it wastes time!

aoa wr wb!
not only does it wastes time, but also puts u in tension if u see smthng that u dont know..
another suggestion...if u're stuck at some question...or if u feel its difficult..leave it and do the others first rather than trying to figure out how to do...

come back to it later...and try not to leave any question...do something, even if u think its wrong, but dont leave it blank

 

[user]

Post the exact question here, maybe I can help.

Aoa wr wb!
can u help me with mine? Q:3 ii of 9709_w10_qp_61.pdf

 

[Hehehaha]

Please help!!!!!!!

1(i)
http://www.xtremepapers.com/papers/...AS Level/Mathematics (9709)/9709_s09_qp_6.pdf

 

[hassam]

Best of luk evry1 giving stats1! 1 suggestion especially if have problems managing time!
Like me DONT read the whole ppr before starting to attempt it wastes time!

Find the number of different ways in which the 9 letters of the word GREENGAGE can be
arranged if exactly two of the Gs are next to each other.
bt please...address my soln....dont post any other soln....i hv already done by an alternative way bt want to knw the problem with this method

 

[Talha]

http://www.xtremepapers.com/community/threads/stats-how-to-solve-this-qs.16285/

plz any1 ans part 2 of this ques.