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A level Statistics doubt??Post your doubts here!

immie.rose

immie.rose

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Kumkum

Kumkum

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immie.rose said:
P(Judy wins with the 2nd choice of cards)= P(0) + P(>=4)

P(0)= 5/25 [you can use a two way table to find out]
and P(>=4) = 10/25 [use your prob. distribution table from part (ii) ]
hence, 5/25*10/25=2/25

(v) i think a relevant alternative ans could be 2/5^n...(though this does not match the mark scheme, somehow).
Click to expand...
ok...this i get it P(>=4) but why do we have to include P(0)?
 
immie.rose

immie.rose

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Kumkum said:
ok...this i get it P(>=4) but why do we have to include P(0)?
Click to expand...
the ques. says that " If the score is 0 they play again"...and then in part (iv) they ask you to find the probabilty that Judy wins with the second choice of cards...hence you include the prob. of zero , times the prob. that judy wins..
hope tht helps
 
Kumkum

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immie.rose said:
the ques. says that " If the score is 0 they play again"...and then in part (iv) they ask you to find the probabilty that Judy wins with the second choice of cards...hence you include the prob. of zero , times the prob. that judy wins..
hope tht helps
Click to expand...
ohh!! now i get it....i didn't read the question carefully...
thank u so much :)
 
Kumkum

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Rutzaba said:
please help sumone
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w09_qp_62.pdf
oct nov 200
1ii
4b
4ii
7ii
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this one i can help u with 4b and 7ii but the other two m not sure
4b) 1 2 3 4 5 6
here u want the number of ways 4 and 5 are not next to each other, so u will have to find number of ways they are next to each other then subtract it from the number of ways the six numbers can be arranged in a line
so first number of ways all numbers can be arranged = 6! =720
now to find number of ways they are next to each other, u can take 4 and 5 as one unit..i mean
1 2 3 4 5 6 u can take it as one so that now u have 5 numbers to arrange that will be 5! and since 4 and 5 are different u can arrange them in 2 ways
so ur answer will be 6!-(5!*2) = 480
so prob =480/720 = 2/3
hope i was clear :)
 
Rutzaba

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Kumkum said:
this one i can help u with 4b and 7ii but the other two m not sure
4b) 1 2 3 4 5 6
here u want the number of ways 4 and 5 are not next to each other, so u will have to find number of ways they are next to each other then subtract it from the number of ways the six numbers can be arranged in a line
so first number of ways all numbers can be arranged = 6! =720
now to find number of ways they are next to each other, u can take 4 and 5 as one unit..i mean
1 2 3 4 5 6 u can take it as one so that now u have 5 numbers to arrange that will be 5! and since 4 and 5 are different u can arrange them in 2 ways
so ur answer will be 6!-(5!*2) = 480
so prob =480/720 = 2/3
hope i was clear :)
Click to expand...
thankyou :)
 
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kevo123

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Ryan123 said:
12/30+13/30....this is because the initial 12 females includes the females who watch kops are kids so they meet all the criterial and so the only other criteria to meet is the men who watch kops are kids which are 13..
(12/30)+(13/30)
Click to expand...
Thanks!:)
 
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