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# OCR (Not MEI) S1 Wednesday 8th June 2016

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1. (Original post by bowders)
Also did anyone get 146.5 for the mean of the apples?
yes
2. What points did everyone plot for the 2 marks in spearmans rank (where rs = 1 but r does not equal 1)
3. (Original post by sen99)
oh **** yeah sorry it was spearmans rank
Haha no worries, you had to use their position on the x and y axis as ranks, so they were 12345 and 12354. I think the final answer was 0.9
4. (Original post by Breynolds2671999)
What points did everyone plot for the 2 marks in spearmans rank (where rs = 1 but r does not equal 1)
Did a straight line with one point higher than the rest
5. (Original post by Breynolds2671999)
I thought it was that < 130 < or equal to 140 (or something like that)
At 140 it is the LQ. At the LQ there is 25%.

100% is 52 apples so 25% is 13.
Thanks! That makes sense
6. (Original post by Ella rivers1)
Yeah I did like probability of x greater than or equal to 2 for n as 3 and p as 0.3

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Did you have to do it that way? I think I just used the probabilities in the table to do it
7. (Original post by h3rmit)
I got 0.04, but 0.072 for the second one
I got 0.04 and 0.072 as well
8. (Original post by Breynolds2671999)
What points did everyone plot for the 2 marks in spearmans rank (where rs = 1 but r does not equal 1)
I did it so that the points created a curved line
9. (Original post by liverpool7867)
For the 'abba' question:

I think it was ((3C2 x 2C2) x (2! x 2!))/ 7C4 x 4! = 1/70

I think that was correct
Yeah that's what I did cause you had to pick 4 from 7 but then there were 4! Ways of arranging that 4 then finding the arrangements of ABBA and just dividing
10. (Original post by swagmister)
I did it do that the points created a curved line
It doesn't matter as long as the ranks were equal and it wasn't a straight line
11. (Original post by cc262626)
Are you sure?! Loads at my school said was wrong
It is right, I did it a weird way, but there were three ways of picking two As and two Bs, so I did 3/7C4 which was 3/35, but then out of the two As and the two Bs, there are 6 ways of arranging them so there's a 1 in 6 chance of it being in the order of ABBA. So I divided 3/35 by 6 which is 1/70, or 0.0143
12. (Original post by swagmister)
I did it so that the points created a curved line
I did the same
13. (Original post by Breynolds2671999)
What points did everyone plot for the 2 marks in spearmans rank (where rs = 1 but r does not equal 1)
a curve
14. can we make a markscheme? on here or a goole docs? just so we can see it all laid out
15. (Original post by Breynolds2671999)
What points did everyone plot for the 2 marks in spearmans rank (where rs = 1 but r does not equal 1)
A zigzag which has a positive correlation, means r not 1 but rs still=1
16. Let's do another community MS. Please press the button to request permission to contribute.
17. wat was the second past of question 1?
18. How did you work out mean of z?
19. 45 marks for an A.
20. (Original post by Btec certified)
45 marks for an A.
I wish , probably about 56 or 57

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