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# Edexcel S1 - 15th June, 2016 [Exam Discussion] watch

1. (Original post by JustOneLastTime)
I got 17 aswell but I'm not sure if its right
I got 33. There were two groups of people that corresponded to the two probabilities that you'd calculated previously.

40 x 0.45 = 18 people
37 x 0.405405405... = 15 people
2. (Original post by iMacJack)
Hey mate do you remember the values when you had to calculate Sxy on the one where you had to show Syy = whatever? Thanks bro

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I think the value you're looking for is something like -113 or -133, it was definitely a minus number in the hundreds.
3. (Original post by hogree)
What you had to do was write out the Standard Deviation Formula. You can work out SigmaY by multiplying the mean by the number of vlaues Because they tell you what the SD is, you only have one "unknown" and that is Sigma(Y^2). So, you work that out by rearranging. And then if you know that, you can just plug values into Syy Formula.

For 1 Mark though, an absolute disgrace.
What i did was squared the SD and then multiplied it by 8, i got the answer but is this enough working out?
4. (Original post by Tomilolaa)
Yeah , I feel like they swapped marks around on that paper , the last question i don't think should have been 3 marks ... but I'm not complaining
Do you think it should be less or more?

I thought it was a bit generous for 3, seemed more like 2 marks to me.

All you had to do was (1-0.82)/0.5
5. What grade would i get if i got c1 61/75 c2 58/75 s1 64/75?
6. Does anyone remember how many marks was the question which said that
"a baby of 3.34kg was added to the data, describe the changes to the mean and standard deviation"
Does anyone remember how many marks was the question which said that
"a baby of 3.34kg was added to the data, describe the changes to the mean and standard deviation"
I think it was 3 marks
Does anyone remember how many marks was the question which said that
"a baby of 3.34kg was added to the data, describe the changes to the mean and standard deviation"
2 marks, 1 mark for mean, 1 For Standard Deviation
9. (Original post by hellomynameisr)
What grade would i get if i got c1 61/75 c2 58/75 s1 64/75?
Could be a High B or a low A. Just depends on the grade boundaries
10. (Original post by hellomynameisr)
What grade would i get if i got c1 61/75 c2 58/75 s1 64/75?
I would say you're just scraping an A with that!
11. Anyone got the paper yet?
12. (Original post by eddie442)
Do you think it should be less or more?

I thought it was a bit generous for 3, seemed more like 2 marks to me.

All you had to do was (1-0.82)/0.5
Definitely less, I agree, 2 marks max... I guess the marks were for understanding though ? I know of a few people who did a.82/0.5 because they didn't spot that (μ - 30) wasn't (μ+30)
I just think that because they were distributing so few marks at the beginning , they had too many left at the end of the paper, so became generous
13. How did people do the "Show that Syy = ..." question? My solution seemed slightly long-winded for one mark.
14. (Original post by metrize)
Anyone got the paper yet?
I havent but really want to see it!
I got r = -0.753 because I used the calculator value of Syy (716 with decimals) and not the given value of Syy (716 to 3sf)

Will I lose marks? Did anyone else get that?
Got that too
16. (Original post by Snasher350)
Could be a High B or a low A. Just depends on the grade boundaries
(Original post by studentsixth)
I would say you're just scraping an A with that!
Thanks
Hoping its an A😅
17. (Original post by SelfishWeiner)
How did people do the "Show that Syy = ..." question? My solution seemed slightly long-winded for one mark.
I equated the sd and had solve it, there has to be a quick way for 1 mark but nobody seems to have got it simple
18. (Original post by metrize)
Anyone got the paper yet?
+1
19. kprime2 are you going to be doing an unoffivial markscheme?
20. (Original post by hogree)
What you had to do was write out the Standard Deviation Formula. You can work out SigmaY by multiplying the mean by the number of vlaues Because they tell you what the SD is, you only have one "unknown" and that is Sigma(Y^2). So, you work that out by rearranging. And then if you know that, you can just plug values into Syy Formula.

For 1 Mark though, an absolute disgrace.
The way you were meant to do it for one Mark was the standard deviation squared times 8, which is much simpler for 1 mark however both methods are valid

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