A level Statistics doubt??Post your doubts here!

[x-gamer-x]

no prob just remember me in ur prayers

 

[x-gamer-x]

plz some one how to do this
it will be so nice

A team of 4 is to be randomly chosen from 3 boys and 5 girls. The random variable X is the number
of girls in the team. Draw up a probability distribution table for X.

 

[A star]

http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s11_qp_62.pdf
Q3 part ii Anika Raisa MustafaMotani

 

[Anika Raisa]

kiara15 ASTAR syed1995 or any 1....

Help me knw how to know the lower class boundary from a cumulative frequency table ....

for example one in Qp 6 in here:
http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s11_qp_61.pdf

i dnt understand 6 iv as in the ms! pls help!!! Reply asap!

 

[syed1995]

(iii) Mutually exclusive events are those which do not contain any shared events i.e nothing common between the two.
If you look closely, the product of two numbers can not be 24 (Event Q) if both the numbers are greater than 8 (Event R). Hence, they are exclusive!

(iv) If two events are independent, P(Q and R) = P(Q) X P(R).
In this case, P(Q and R) = 0, since they are exclusive, and P(Q) X P(R) = 1/24 X 1/9 = 1/216.
P(Q and R) ≠ P(Q) X P(R).
Therefore, they are not independent.

Thanks a lot for that mate!! Jazak Allah!

 

[Anika Raisa]

http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s11_qp_62.pdf
Q3 part ii Anika Raisa MustafaMotani

Here c from every data 45 has been deducted so here also from 29 u deduct 45 n so u get -16 ok...
now add this -16 to -148 so u get the new value for Summation of (x-45)!
now add square of this value to summation of (x-45)^2
u get a new value for it!
Now use them in d sd formula as b4! bt nw n=37!

Hope i cud b helpful! N sorry 4 l8 reply ma comp was hanged (well not literally) !

 

[lisahamed]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w11_qp_61.pdf no.5 i please..

 

[A star]

Here c from every data 45 has been deducted so here also from 29 u deduct 45 n so u get -16 ok...
now add this -16 to -148 so u get the new value for Summation of (x-45)!
now add square of this value to summation of (x-45)^2
u get a new value for it!
Now use them in d sd formula as b4! bt nw n=37!

Hope i cud b helpful! N sorry 4 l8 reply ma comp was hanged (well not literally) !

how in the world do u think up of this stuf :O

 

[x-gamer-x]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_61.pdf no.5 i please..

within 12g means
20+12 and 20-12
so P( 8< 32 ) = 0.94
now standardize this and solve

 

[Anika Raisa]

how in the world do u think up of this stuf :O

Oh its just i had practised this b4! Nthing else! Just hope i cn think clearly during xam! Cz i screwed up P3 by getting blank in xam hall!

Btwn any idea hw to know the lower class boundary fron a cumulative frequency table when u r given </=100 in the first column example in Q.6 here: http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w11_qp_61.pdf

I knw that for </=150 the range wil b 100.5-150.5 but i cnt work out the first range!!

 

[A star]

Oh its just i had practised this b4! Nthing else! Just hope i cn think clearly during xam! Cz i screwed up P3 by getting blank in xam hall!

Btwn any idea hw to know the lower class boundary fron a cumulative frequency table when u r given </=100 in the first column example in Q.6 here: http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_61.pdf

I knw that for </=150 the range wil b 100.5-150.5 but i cnt work out the first range!!

dw you will do great well to find out lower class boundry <=100 that means if this is the first quantity then it will be like 0-100 but if there was also <=50 then 51-100 i think

 

[abruzzi]

Guys.. I need some help!

I don't understand how to figure out the lower and upper boundaries of the 2 different sets of data below:

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_61.pdf
Qn no. 6. What are the boundaries of the data?

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_63.pdf
Qn no. 3. What about this one?

I'll really appreciate your help asap.

Thanks

I'm re-posting this.. anyone?

 

[Alice123]

http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s10_qp_62.pdf
Q7 iv n v

 

[LMGD33]

" The masses of articles produced in a particular workshop are normally distributed with mean 51.3 g and standard deviation 20.5 g. Find the symmetrical limits, about the mean, within which 75% of the masses lie."

someone PLEASE explain!
[ans: a=27.7 , b=74.9]

Hope this helps, good luck guys!!

 

[immie.rose]

View attachment 27226

Hope this helps, good luck guys!!

Jazak Allah

 

[A star]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_qp_62.pdf
Q7 iv n v

tag me in the sol as well

 

[A star]

guys what acording to you is a par score in this paper ?

 

[LMGD33]

tag me in the sol as well

Part iv : You have P _ _ So thats 8C2 * 3! Because the three cards can take different orders = 168

Part v : You have P G _ Or _ P G Or G P _ Or _ G P So thats 7C 1 * 4
However they asked for do not have blabla so thats your answer in Part iii (9C3 * 3!) - (7*2*2) = 476

 

[A star]

ok i thought we also had to find out the solutions of inhow many p was there

 

[Kumkum]

pls help me with question 7iv and v
http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s11_qp_62.pdf