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

1. (Original post by Zacken)
But 0.75 includes the probability that the third person gets a merit as well, in which case you'd get 3 merit marks when the question specifically wants exactly 2 merit marks. So the probability that the third person passes but does not get a merit is 0.75 - 0.25
Can you use p(A|B) with this, given that all 3 pass?
2. (Original post by thelegend99)
Can you use p(A|B) with this, given that all 3 pass?
No. You could still have 3 passes and all three people get merits. This question has nothing to do with conditional probability.
3. (Original post by Zacken)
1) 3 sig figs. But all working previous to the final answer should be to as much accuracy as possible, only round to 3 sig figs at the end.

2) use asterisks to denote the outliers.
So when we are working out the a we use the fraction value of b not the rounded one?

And thanks
4. (Original post by Mina_)
Attachment 550135

Can someone explain part (d)
Please can you link the jan 16 ial model answers (/answers) and questions? Thanks!
5. (Original post by SweetChilliCake)
Ahh so you expand the brackets first 😃. Thanks.
What paper is this from
6. hoping all the questions are good.
the questions are going to be similar to past papers and of course there is a CALCULATOR
7. (Original post by Zacken)
No. You could still have 3 passes and all three people get merits. This question has nothing to do with conditional probability.
Gotcha, thanks! I think you get asked this a lot, but would you say that ial 2016/2015 are the hardest ones?
8. solomon papers are useful
9. and obviously do more of the real-style ones
10. (Original post by thelegend99)
Gotcha, thanks! I think you get asked this a lot, but would you say that ial 2016/2015 are the hardest ones?
Not really, I sat 2016 IAL and thought it was really easy. The grade boundaries seem to disagree though?
11. for the jan 2016 international paper for 5c, does anyone know why the answer is negative 0.8416, rather than positive?

thanks
12. Does anyone have a summary of how coding affects things
13. How many significant figures for answers?
14. (Original post by Mina_)
What paper is this from
Solomon L
15. (Original post by Zacken)
Not really, I sat 2016 IAL and thought it was really easy. The grade boundaries seem to disagree though?
Yeah, that does seem kinda low for an A
16. (Original post by popan006)
for the jan 2016 international paper for 5c, does anyone know why the answer is negative 0.8416, rather than positive?

thanks
When you draw out the norm distribution graph, the 18 is on the left side, therefore it's negative
17. has anyone got anything with key points to remember for tomorrow
18. (Original post by HeenaChowdry)
So when we are working out the a we use the fraction value of b not the rounded one?

And thanks
Yeah
19. OK guys,

I've been losing marks on those type of questions that revolve around normal distribution and conditional probability. Here are 2 examples of a similar method for answering. What shall I do when answering these questions?

JUN 13 Q4c)
Spoiler:
Show

JAN 13 Q5c)
Spoiler:
Show

20. Hi, for last year's June 2015 paper. In the last question they've written P(X>w / X>28)
Is that "/" a divide sign or a "given that" sign?
Thank you

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