Mathematics: Post your doubts here!

[smartangel]

Im sorry. Well. good uck. But my, p63 w11 is HARD

good luck to you as well! and thanks a lot for helping me out...

 

[smartangel]

Im not sure. but i think u can take probability at 63 to be 0.75 since it is upper quartile. u do know the mean.
P(63-mean/ S.D) =.75
try

yeah thats how we do it! thanks!

 

[smartangel]

Remember the fi thing i said before, use that formula

P( k-mean/standard devation <Z< 128-mean/s.d) = .7465

yeah i tried that but couldnt get the answer..could you plz do it?

 

[hassam]

Well, this was how I'd solved it before:

Simply 'choose' 2 Gs out of 3, and the remaining 7 letters can be completely random!

G G _ _ _ _ _ _ _...............[consider GG to be 'attached' together so that it can alternate in 2! ways]

n = 2! x 3c2 x 7!.................. [but don't forget that there are 3 recurring Es too!]
..............3!
...= 5040...... Q.E.D


P.S. If you're still uncertain, let me know. I'll work in it one more time.

CNT GET UR WAYYY,,,,,,,,my stratergy was too find two Gs 2gether,,,,,,without emphaisizing exctly 2 meaning i ll have calculated both 2 and 3 and then subtract that from exactly 3....bt dount knw where's the problem

 

[Richmondtan]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s03_qp_6.pdf

and

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_63.pdf

in S03 question 7i), the midpoint was found using (0+5)/2 but in S11 q3 iii) the midpoint was found using (0+9)/2

how come?

 

[leadingguy]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s10_qp_63.pdf
http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_s10_ms_63.pdf

question 3 part iii how to do?/ m unable to get
plz any one

 

[JulyMei]

help???

thanks in advance

 

[mukki]

View attachment 10603

help me on 4 ii)

E=summation easy calculate E(x) because its the same for both. E(x) = 245 +E(60)=4445
then find E(x-50) = Ex -E50=4445-70*50=945

 

[mukki]

help???

thanks in advance

this question has been solved three to 4 times plz check from pages 170 onwards

 

[Richmondtan]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_qp_63.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_ms_63.pdf

question 3 part iii how to do?/ m unable to get
plz any one

Since probability of going to park is 0.6,hence not going is 0.4. The dog barks when goes to park = 0.6x 0.35 aand not going to park = 0.4x0.75.Sum it up =)

 

[JulyMei]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_qp_63.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_ms_63.pdf

question 3 part iii how to do?/ m unable to get
plz any one

use "npq"

n=30
p=0.6
q=0.4

30 x 0.6 x 0.4 = 7.2

 

[leadingguy]

Since probability of going to park is 0.6,hence not going is 0.4. The dog barks when goes to park = 0.6x 0.35 aand not going to park = 0.4x0.75.Sum it up =)

sorrY bt have askd fr the last part any ways thanx fr ur co-operation i gt ma answer

 

[reina81]

this question has been solved three to 4 times plz check from pages 170 onwards

i know how to solve this i was just wondering when should we use this method and when do we just use the probability they've given?

 

[JulyMei]

i know how to solve this i was just wondering when should we use this method and when do we just use the probability they've given?

the probability given will be still using it.. and when they say "within", we hv to find the lower and upper boundary.

 

[shan5674]

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

why is there a x2 in Q7(ii)?

 

[user]

Aoa wr wb!

need help with Q:3 ii of 9709_w10_qp_61.pdf

Khan_971 why did we do that way..the question i asked u earlier...?

 

[mukki]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w10_qp_63.pdf

why is there a x2 in Q7(ii)?

what do u mean x2?

 

[reina81]

the probability given will be still using it.. and when they say "within", we hv to find the lower and upper boundary.

ohh ok
do you mind helping me with this Q2, i, I made a correct tree diagram but i keep getting 31/30 as the probability.

​

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w11_qp_63.pdf​

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w11_ms_63.pdf​

 

[mukki]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w10_qp_63.pdf

why is there a x2 in Q7(ii)?

dude i did it my way first taking P(X>9.2) then adding the probability found to P(X<7.2) ul get the same answer

 

[omar hazem]

please in june 11 63 S1 question 5)iii), i need to know why they used CONTINUITY CORRECTION in the mark scheme although there was no term in the question indicating this like normal approximation or suitable approximation??
please answer soon to help me and others