MEI S1; anyone else find . . . Watch

Expression
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#81
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#81
(Original post by ~Bex~)
I'm not entirely sure what that is lol, but the question was simple enough. It asked you to work out something along the lines of the probability of 2 out of 30, and the previous part had already required you to work out the probability of 0 and 1, so all you had to do was work out the probability for 2 and add them up.
Bex, wasn't a reply to your post above mine, was a question for the person I quoted, from a post in Page 1 of this thread.

And for your ref:

If a binomial variable is to be modelled by a Normal Distribution, then the Normal Variable must have the same mean and variance.

Mean of B(n,p) = np
Var of B(n,p) = npq (where q=1-p).

X~B(n,p) ===> X~N(np, npq)
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sugardaddy
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#82
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#82
(Original post by moonscape)
Yeah, everyone found it really hard in my school too, though I thought it was relatively easy compared to the questions in the book.

This was what I did to get for the 3 paintings, god knows why I still remember these questions:

P(genuine given it was judged fake) = 1-0.64= 0.36
or you could have done 0.9*0.05 / 0.125=0.36

P(getting 3 genuine in the 2nd test given it was judged fake in the 1st test)
= (0.36*0.96) ^3
= 0.041

not sure whether this is the correct answer though
Ahh. I think I done the same, but not the ^3 which didn't seem so obvious at the time.
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~Bex~
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#83
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#83
(Original post by Expression)
Bex, wasn't a reply to your post above mine, was a question for the person I quoted, from a post in Page 1 of this thread.

And for your ref:

If a binomial variable is to be modelled by a Normal Distribution, then the Normal Variable must have the same mean and variance.

Mean of B(n,p) = np
Var of B(n,p) = npq (where q=1-p).

X~B(n,p) ===> X~N(np, npq)
I know you weren't replying to my post lol. I was commenting on your reply to the other post, saying that it was a simple enough question and that was all you had to do to work it out.
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Expression
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#84
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#84
(Original post by ~Bex~)
I know you weren't replying to my post lol. I was commenting on your reply to the other post, saying that it was a simple enough question and that was all you had to do to work it out.

LOLZ, oh well ! Sorry for the confusion !

:cool:
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Pban
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#85
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#85
The Normal Approximation to Binomial is only in S2 for MEI. There was a lot of it in S2. But there is no way we would have been expected to do that in this exam... unless they were being really mean:mad:
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#86
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#86
(Original post by Pban)
The Normal Approximation to Binomial is only in S2 for MEI. There was a lot of it in S2. But there is no way we would have been expected to do that in this exam... unless they were being really mean:mad:
Okey, in which case they can't possibly expect you to use that if it only gets taught in a subsequent module !!

I think I probably suggested it as because when I did AQA Maths, it appears in S1, but then we had already done some Stats in the Methods module, so I guess content isn't quite in sync.
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