Mathematics: Post your doubts here!

[smartangel]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w11_qp_62.pdf
Q6!! part ii

 

[WhereAmazingHappens]

where is mechanics 2?

 

[mominzahid]

part a(ii) anyone please?

 

[shan5674]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_62.pdf
Q1.im getting 7.95..are any of you getting the same answer as marking scheme which is 7.68..idk where im going wrong in this one!
also Q4 ii of the same paper! how do we do it????

I keep getting 7.61 :S
and question 4(ii) i found the LQ and UQ and got that right but i dont get how they got the 5 and 20 :/ sorry

 

[Vinnyvinvin]

Any1 can help me with p6 mj11 q3 (iii)
Im not sure how to get the mid point of the marks
Thanks

 

[Mad-Eye]

Eight cards are selected with replacement from a standard pack of playing cards
with 12 pic cards, 20 odd cards
and 20even cards.
a) how many different sequences of cards are possible?
b) how many of the sequencees in part (a) will contain three picture cards, three odd cars and two even cards??

 

[ppaayas]

FIRST FIND THE PROBABILITY THAT RAJ's score is 12 with both even and odd numbers on the spinner.
Probability of getting an even number on the spinner is 2/5 and then of getting 12 is P(2,6)*2 + P(3,4)*2
So it becomes 2/5 *( P(2,6)*2 + P(3,4)*2)=2/45
now for the odd one. Probability of getting an odd number on the spinner is 3/5 but this time u will have to add two numbers to get 12 and hence p(6,6)=3/5*1/6*1/6=1/60
so P(SCORE=12) is 1/60 +2/45 =11/180
To find the conditional probability P(E|12) =2/45 devided by 11/180 = 8/11

But where do you get the six from? Its five-sided?

 

[hassam]

umm i think because 2 G"s can be placed before the 7 letters or after them..

dint undrstnd......it has nth to wid dat

 

[smartangel]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w11_qp_61.pdf
Q3i..how d owe get the probability table? as in i dont knw how to get the probabilites..i dont understand ms method..

 

[smartangel]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_61.pdf
Q6..a ii.. why dont we do 4! x 8! x 6 /2! x 2! x 3!
4! for the vowels..8! for the rest and 6 because the vowels(that we consider as 1 group of 4) can occupy any place right?

 

[smartangel]

GUYS. come on. some help would be highly appreciated. i"ve posted so many queries..plz answer..paper tomorrow!!

 

[mukki]

But where do you get the six from? Its five-sided?

dude the spinner is 5 sided not the two dice

 

[mukki]

But where do you get the six from? Its five-sided?

totally forgot to tell you that dude the score must be calculated from the dice

 

[ppaayas]

Thank you helpful guy! What grade are you prospecting?

 

[mukki]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_61.pdf
Q3i..how d owe get the probability table? as in i dont knw how to get the probabilites..i dont understand ms method..

x 1 2 3 4 because there are 4 people to be selected and x represents the number of girls selected.
P(X=1) = p(bbbg)*4!/3!=3/8 * 2/7 *1/6 * 5/5 * 4= 1/14
P(X=2) =p(bbgg) *4!/(2!*2!) = 3/8 * 2/7 * 5/6 * 4/5 *6 = 3/7
P(X=3) =p(bggg) *4!/3! = 3/8 * 5/7 *4/6*3/5 *4 = 3/7
P(X=4) =p(gggg) *4!/4! = 5/8 * 4/7 * 3/6 * 2/5 = 1/14
You have to make arrangements here to because any guy/girl can be selected first .Here you go just remember after a girl/guy is selected he/she cant be selected again so consider without replacement

 

[mukki]

Thank you helpful guy! What grade are you prospecting?

dont know dude depends on the paper and if my brain is functioning at that time too many thoughts you know

 

[mukki]

I keep getting 7.61 :S
and question 4(ii) i found the LQ and UQ and got that right but i dont get how they got the 5 and 20 :/ sorry

just use more than 3 s.f for the mean which u take while calculating the standard deviation it gives a more precise answer

 

[sunnyexo]

Can anyone help me with this question...It's about permutation= =2011 OCT statistic 9709/62-------Q2
http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w11_qp_62.pdf

 

[Wanzi21]

Can u explain this??

 

[Khan_971]

Q.6 part 2:
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_62.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_ms_62.pdf
Why they do 1 - 0.214??

im gonna do this paper now and will try to get back to you.