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

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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?

Reply 541

Zacken

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.

Reply 542

HeenaChowdry

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

Reply 543

thelegend99

Original post by Mina_

Can someone explain part (d)

Please can you link the jan 16 ial model answers (/answers) and questions? Thanks!

Reply 544

Mina_

Original post by SweetChilliCake

Ahh so you expand the brackets first 😃. Thanks.

What paper is this from

Reply 545

11...

hoping all the questions are good.
the questions are going to be similar to past papers and of course there is a CALCULATOR :smile:

Reply 546

thelegend99

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?

Reply 547

11...

solomon papers are useful

Reply 548

11...

and obviously do more of the real-style ones

Reply 549

Zacken

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?

Reply 550

popan006

for the jan 2016 international paper for 5c, does anyone know why the answer is negative 0.8416, rather than positive?

thanks :smile:

Reply 551

metrize

Does anyone have a summary of how coding affects things

Reply 552

xMillnsy

How many significant figures for answers?

Reply 553

SweetChilliCake

Original post by Mina_

What paper is this from

Solomon L

Reply 554

thelegend99

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

Reply 555

Mina_

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 :smile:

When you draw out the norm distribution graph, the 18 is on the left side, therefore it's negative

Reply 556

Exams987

has anyone got anything with key points to remember for tomorrow

Reply 557

Zacken

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

Reply 558

AlphaWolfZ

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

JAN 13 Q5c)

Spoiler

Reply 559

Pink1998