What did you guys think? How did you do the last question about the Pento game with Sam/ Tessa? I think I lost like 14 marks due to the last 3 parts of that question whoops.

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It was an arithmetic series with the money he could win I think. You then used the expected number of wins np from the formula book for binomial. The problem I had is I kept on coming out with 1/25 (n^2-20n) instead of 16n. Does anyone know where I went wrong as I couldn't see why it wasn't working.

Original post by tomas829

It was an arithmetic series with the money he could win I think. You then used the expected number of wins np from the formula book for binomial. The problem I had is I kept on coming out with 1/25 (n^2-20n) instead of 16n. Does anyone know where I went wrong as I couldn't see why it wasn't working.

(edited 1 month ago)

Original post by tomas829

It was an arithmetic series with the money he could win I think. You then used the expected number of wins np from the formula book for binomial. The problem I had is I kept on coming out with 1/25 (n^2-20n) instead of 16n. Does anyone know where I went wrong as I couldn't see why it wasn't working.

I had exactly the same problem with that part. How did people answer the last two parts of question 7?

Original post by tomas829

Yh I think the issue is it wasnâ€™t a series because he got 2 then 4 and only gets 2w on his wâ€™th win. This also is definitely no where near the answer when you use it as the amount he gains. I only realised after tho and got 20n too so Iâ€™m very confused

what did you guys get for var(x) for the pgf

Original post by itsyash_123

what did you guys get for var(x) for the pgf

6?

Original post by orderly-shelter

6?

yh and what was your var(x^2) for the first question

Original post by itsyash_123

yh and what was your var(x^2) for the first question

97 or soemthing like thst

Original post by itsyash_123

yh and what was your var(x^2) for the first question

97.69

Original post by alx2346

what did you guys use for question 5, the factory question, poisson approximation or binomial distribution?

I cannot remember the question well but I think I used binomial distribution.

Original post by Euan1871

I also got that and so did over half my class, we suspect that the exam board may have got it wrong or we all made the same mistake.

No I made the same mistake but it is acc 16 itâ€™s because when getting 20 u find the mean no. Of wins first and then use that to calculate the amount gained but thatâ€™s not right. Ur express the profit in terms of the random variable and then do the expected value which gives 16

Original post by notmeyou

I cannot remember the question well but I think I used binomial distribution.

i might be cooked then, i used poisson just because N was large(n=100 and n=80) and p was small( p=0.03) and teh question was about a hypothesis test

Original post by notmeyou

97.69

Original post by alx2346

i might be cooked then, i used poisson just because N was large(n=100 and n=80) and p was small( p=0.03) and teh question was about a hypothesis test

Original post by itsyash_123

did you do E(X^4) - (E(X))^2 cus i got some large number asw

Yeah

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