Urgent Help needed in Statistics

[SalmanPakRocks]

guys I need help in N07/P2/Q9
It is urgent and here is the link to the question paper
http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_2.pdf

 

[scouserlfc]

for the first time i cant help !!
anyways anyone help him! i would say u ask Nibz,hamid,math angel,abcde or someone who is in A levels they can easily solve this !!

 

[abcde]

AoA!
Warner: I have never before looked at a Stats paper until just now and have never really studied the subject. Nevertheless, I hope with all sincerity that my try below would help you.
(i) P (winning two Gold) = 2/12 x 3/16 = 1/32
P (winning two Silver) = 3/12 x 4/16 = 1/16
P ( winning two Bronze) = 9/16 x 7/12 = 21/64

(ii) Common sense suggests that if the game is to be fair the amount of money earned by the contestants should be equal to the amount charged.
=> Amount charged = (1/32 x 10) + (1/16 x 5) + (21/64 x 2)
= 5/16 + 5/16 + 21/32
= (10 + 10 + 21) / 32
= 41/32
approximately equal to $1.28 (to 2 d.p.)

(iii) This part tells you that the amount charged is actually $2 whereas a contestant can only earn $1.28 through the game as calculated above. So obviously, he/she would suffer a LOSS which can be calculated by simple subtraction = $(2 - 1.28) = $ 0.72.

(iv) Similar to (i).
P (winning two Gold) = 5/28 x 4/27 = 5/189
P(winning two Silver) = 7/28 x 6/27 = 1/18
P (winning two Bronze) = 16/28 x 15/27 = 20/63.

(v) Similar to (ii).
Amount charged for fair game = (5/189 x 10) + (1/18 x 5) + (20/63 x 2)
= 50/189 + 5/18 + 40/63
= (100 + 105 + 240)/378
= 445/378
approx. equal to $1.18.

(vi) For this new game, the contestant would have to suffer a LOSS of $(2 - 1.18) = $0.82. This is greater than the loss of $0.72 as in the previous game so compared to the original game, this new game is to the disadvantage of the contestant. (Poor contestant, should've calculated the probabilities before eh? )

 

[SalmanPakRocks]

Abcde thank you so much !! Actually I find the chapter of Probability most hard !!

 

[abcde]

You're welcome! I'm so glad it helped.
Nothing different here though. That was simple Mathematics.

 

[SalmanPakRocks]

You're welcome! I'm so glad it helped.
Nothing different here though. That was simple Mathematics.

Well I was a bit confused because Probability in Maths is much easier that in Statistics !!

 

[scouserlfc]

i hate the statistics part of maths :x

 

[SalmanPakRocks]

i hate the statistics part of maths :x

me too but my dad forced me to take it !!

 

[OakMoon!]

Statistics is infact the easier part of Mathematics. It's the scoring one. You can get alot of marks for just drawing graphs and stuff, which is always an advantage for you.

 

[SalmanPakRocks]

Statistics is infact the easier part of Mathematics. It's the scoring one. You can get alot of marks for just drawing graphs and stuff, which is always an advantage for you.

all is easy expect for that Probability !! :twisted:

 

[OakMoon!]

Probability is the main part of Statistics. In A'level Mathematics the name of one of the papers is "Statistics and Probability". So you can realise the importance of it.

 

[scouserlfc]

yup u are right mate but i never seem to get the hang of this probability it always confuses me instead of me confusing it !!

 

[saifali123]

for statistics help visit
http://helpgce.blogspot.com
this is really good everything is covered