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

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1. (Original post by XBen1999)
Yeh I did that but I think I got the wrong answer how many marks will I lose?
I reckon 1
2. (Original post by sen99)
How do you do the standard deviation question and what was the answer
i can't remember a sd question being in it, ive probably just forgotten and there was one but idk
3. (Original post by Jamesk123)
149-140
How did you get that?
4. (Original post by kassy12324)
How did you work out the box plot question?
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.
5. (Original post by Breynolds2671999)
I just worked out the probability for 10, 11, 12, 13, 14, 15, 16, 17, 18 and 19 and added them together.
Wow, that must have taken you an age!! I guess it's a good way to be sure that you're right, though
6. (Original post by Breynolds2671999)
At 140 it is the LQ. At the LQ there is 25%.

100% is 52 apples so 25% is 13.
wouldn't it be 12 bc it said less than 140
7. (Original post by sen99)
How do you do the standard deviation question and what was the answer
Where was the standard deviation question, i dont remember one?? Did you mean the variance one?
8. (Original post by student199919)
for the barbara question, did anyone else get 1/210?
Yeah I got that too
9. Can doe one make a google doc for a markschemes?? Thanks 😀
10. 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
11. (Original post by Ozil5)
Where was the standard deviation question, i dont remember one?? Did you mean the variance one?
The one with the graph
12. (Original post by Ozil5)
Yeah i think you were meant to, i did anyway
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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13. You can solve it using probability. The probs of getting a was 3/7 then b is 2/6 then 2nd b is 1/5, last a is 2/4. Times all together and you get 1/70? I think it was
14. (Original post by sen99)
wouldn't it be 12 bc it said less than 140
I got that
15. (Original post by sen99)
wouldn't it be 12 bc it said less than 140
I can't remember the exact question but i got around 12 or 13 can't really remember
16. (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

Posted from TSR Mobile
Yeah i did the exact same thing, i think thats correct
17. (Original post by sen99)
The one with the graph
Do you mean spearmans rank or did i miss out a question lool
18. (Original post by Ozil5)
Do you mean spearmans rank or did i miss out a question lool
oh **** yeah sorry it was spearmans rank
19. (Original post by sen99)
wouldn't it be 12 bc it said less than 140
Yeah 13th Apple is position of LQ so 12 apples
20. (Original post by Jamesk123)
I got 7C4 as the total amount =35
And then 2! X 2! = 4 so 4/35
I just did
3*2*1*2
7 6 5 4
for ABBA as that is the probability of each letter in each place. I checked this with
3!*2!
7P4
As this is the amount of ways the ABBA can be arranged by mixing up the A's and B's if that makes any sense. So The total ways you can get ABBA which = 12 (3! * 2! = 12).
On the bottom is the total ways of arranging it with any set of 4 letters in any of the 4 places (So you could have CACB etc.) And 7P4 = 840.
12
840 =
1
70
Sorry feel that wasn't worded well but hopefully you can see what I mean.

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