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AQA A2 Mathematics MS2B Statistics 2B - 21st June 2016 Watch

1. (Original post by sam_97)
Volvox aureus - 4.5
Volvox globator - 2.3
Volvox tertius - 1.2
remembered them random names as well
2. (Original post by Jm098)
remembered them random names as well
Haha thanks
3. (Original post by Ayeros)
It looks like he did 2(0.35x0.45) to get that answer, guess I got it wrong. Brain fart and only put (0.35x0.45) = 0.1575
1 mark for that - it's what I did.

(Original post by tanyapotter)
was it just 0.35x0.45 for that one question?
0.35 X 0.45 X 2 (2 different combinations)

(Original post by irMike)
Ah, Yeah I got that. Also went for the midpoint for the mean, But I thought that was the sample mean while it wanted the population mean so I was confused, Think it's right though.

As always I couldn't think of reasons why It's not a poisson distribution, I pretty much take off two marks on every paper knowing I'll get that one wrong. What was the answer?
Poisson has no upper limit (book stores said you can have a maximum of 6 books) and borrowing books doesn't occur at a constant average rate (library closes/opens at certain dates/times)
4. Ideas on grade boundaries? I'm hoping 72/73 will be enough for full UMS
5. What is a Volvox Sphere even?!
6. (Original post by MahuduElec)
What is a Volvox Sphere even?!
According to several websites, Volvox is a genus of green algae. I thought I was sitting a biology exam when I opened the paper!
7. How many marks for the book question with 2 people selecting books?
8. (Original post by Salty carpet)
How many marks for the book question with 2 people selecting books?
3 marks
9. (Original post by samham998)
Ideas on grade boundaries? I'm hoping 72/73 will be enough for full UMS
Well it was 72 marks for 100 UMS last year, so assuming the grade boundaries don't change too much it's possible
10. (Original post by sam_97)
Well it was 72 marks for 100 UMS last year, so assuming the grade boundaries don't change too much it's possible
Last year's paper was harder Imo, i think 100 UMS this year will be 73 at a minimum
12. (Original post by Hassan55)
Yup.
13. (Original post by MahuduElec)
Last year's paper was harder Imo, i think 100 UMS this year will be 73 at a minimum
Yeah maybe, although it's difficult to tell as we don't know how everybody who sat the exam has done
15. I had no idea what to put as to the second mark for the DRV/Poisson bit (For the first I said variance does not equal mean) so I put the events do not occur randomly or singly, anyone think this will get me a mark?
16. (Original post by Hassan55)
]

I would say similar to last years although I think this years was slightly easier?

67 A*

62 A

56 B

50 C

Although I think the 1/2 markers were a bit trickier this year so I wouldn't be surprised to see similar boundaries
17. How was 1)d supposed to be done?
18. it was 0.1cm^3 so was it like lambda = 0.8 because it was the total?
19. (Original post by FurtherBod)
it was 0.1cm^3 so was it like lambda = 0.8 because it was the total?
I got that
20. (Original post by Hjyu1)
I got that
Yeah, If I got this I think I'm in for an A

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