sonal7
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could you give me a clue or two to start.
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sonal7
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I was unable to add link in the OP it seems.
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mqb2766
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(Original post by sonal7)
I was unable to add link in the OP it seems.
What sort of distribution are you using?
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sonal7
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(Original post by mqb2766)
What sort of distribution are you using?
i think its geometric. then binomial.I have 'done it' but my answer does not match.

i got x^5= 0.951
so x=-.98 but the ans book says x=0.99

then i got that p =1-0.98 which 0.02 but the ans book 0.01

x~B(1000,0.02) whereas the ans book says B(1000,0.01).

so my mean is np which is 20 and the ans is supose to be 10?

HELP
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the bear
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(Original post by sonal7)
could you give me a clue or two to start.
part b) mentions using a Poisson approximation iirc. so that should give you an idea with how to begin.
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sonal7
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(Original post by the bear)
part b) mentions using a Poisson approximation iirc. so that should give you an idea with how to begin.
i was only doing part a) when i got stuck but thanks need to move on.
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mqb2766
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(Original post by sonal7)
i think its geometric. then binomial.I have 'done it' but my answer does not match.

i got x^5= 0.951
so x=-.98 but the ans book says x=0.99

then i got that p =1-0.98 which 0.02 but the ans book 0.01

x~B(1000,0.02) whereas the ans book says B(1000,0.01).

so my mean is np which is 20 and the ans is supose to be 10?

HELP
Check the root of 0.951?
Or take your answer to the fifth power
Last edited by mqb2766; 1 month ago
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the bear
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(Original post by sonal7)
i think its geometric. then binomial.I have 'done it' but my answer does not match.

i got x^5= 0.951
so x=-.98 but the ans book says x=0.99

then i got that p =1-0.98 which 0.02 but the ans book 0.01

x~B(1
000,0.02) whereas the ans book says B(1000,0.01).

so my mean is np which is 20 and the ans is supose to be 10?

HELP
0.9510.2= 0.99000207164
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sonal7
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(Original post by the bear)
0.9510.2= 0.99000207164
I dont get this at all then.
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sonal7
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(Original post by mqb2766)
Check the root of 0.951?
Or take your answer to the fifth power
That makes sense. It 0.99 phew!!! I have an additional favour to ask. Edexcel have released some papers but I cant work out which one They are . I am doing DM and S1 options.

https://qualifications.pearson.com/e...s-for-students
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mqb2766
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Sorry cant give a definitive answer.
A useful (binomial) approximation when x is small is
(1-x)^n = 1 - nx
This fits nicely with this question x=0.01, 1-nx=0.95.
Last edited by mqb2766; 1 month ago
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sonal7
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(Original post by the bear)
0.9510.2= 0.99000207164
i got this. thanks for the correction!
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