# Arsey's S1 Edexcel Answers 18th Jan 2013Watch

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6 years ago
#181
For question 6a, I drew the probability distribution table in a different way. I drew it like this:

B | 1 1 3 3 5 5

PX=x |1/6 1/6 1/6 1/6 1/6 1/6

Do you think i will lose all of the marks?
0
#182
(Original post by otrivine)
Hi arsey how are you

quick question for D1 do you think scheduling could come up and what do u predict will be the D1 harder than june 2012
recovering from a winter bug, otherwise good thank you.

Well it will either be scheduling or Gantt. I wouldn't be surprised if it was a tricky scheduling but it will probably be a Gantt.

I would hit those definitions hard. Practice paper B is a great paper to go over, stacks of definitions on it.

My guess would be slightly harder than a standard paper. If they wanted to make it trickier they could hammer you with a hard linear programming, so spend some time going over those. Especially awkward ones where you may need to use simultaneous equations then point testing around the decimal answer. Partially forming from the context is pretty much certain.

Maybe drawing an activity network, from a precedence table.
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#183
(Original post by JackersAFC)
For question 6a, I drew the probability distribution table in a different way. I drew it like this:

B | 1 1 3 3 5 5

PX=x |1/6 1/6 1/6 1/6 1/6 1/6

Do you think i will lose all of the marks?
yes
0
#184
(Original post by ljh950912)
Is there any possibility that the exam board will accept both answers or something? Having seen what people have said, almost half of the people got 0.0139. In addition, bad wording is kinda their fault, isn't it?

Posted from TSR Mobile
no, zero
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6 years ago
#185
You saw the mark scheme right? So are your answers the correct one?
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6 years ago
#186
(Original post by Arsey)
recovering from a winter bug, otherwise good thank you.

Well it will either be scheduling or Gantt. I wouldn't be surprised if it was a tricky scheduling but it will probably be a Gantt.

I would hit those definitions hard. Practice paper B is a great paper to go over, stacks of definitions on it.

My guess would be slightly harder than a standard paper. If they wanted to make it trickier they could hammer you with a hard linear programming, so spend some time going over those. Especially awkward ones where you may need to use simultaneous equations then point testing around the decimal answer. Partially forming from the context is pretty much certain.

Maybe drawing an activity network, from a precedence table.
Thats good

the june 2012 had a hard linear programming.
Do you mean those types

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#187
Hey just wamted to point out your last question is wrong
your b join c should be be 0.09 check it with a join b 0,35 x 0.45 does not equal to 0.13

Instand, you should use the fact that it is mutual exclusive to find auc=0.65 and then you find the answer.

I used your method too, so i know its wrong. My friend told me the right method afterwards but i forgot it

I know for absolute certainty that I am right as a) I have taught this for over 15 years and b) I have the actual mark scheme.

P(AnB) only equals P(A) x P(B) when they are independent.
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6 years ago
#188
(Original post by cera ess six)
irrelevant to S1 but you have any predictions for C3 this Jan? you predicted the 'Sum of' formula for C2 in may!
iherwn
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#189
(Original post by otrivine)
Thats good

the june 2012 had a hard linear programming.
Do you mean those types

they could make it ten times harder than that one if they wanted to.
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6 years ago
#190
(Original post by Arsey)
they could make it ten times harder than that one if they wanted to.
Are you joking ? are they going to be that cruel

What other hard questions can I do ,I did all the past paper questions and the mixed exercise
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#191
(Original post by cera ess six)
iherwn
I have not been teaching C3 last term so I don't know off the top of my head what has been on the last few papers. If I get chance I will have a look.
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#192
(Original post by otrivine)
Are you joking ? are they going to be that cruel

What other hard questions can I do ,I did all the past paper questions and the mixed exercise
Check out my revision thread on D1. Do the practice papers, particularly B.

I also uploaded all of the old spec papers which I adapted to new spec. Some of those had harder linear programming ones and trickier scheduling.
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#193
You saw the mark scheme right? So are your answers the correct one?
I got hold of the mark scheme after I wrote my solutions but yes.
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6 years ago
#194
(Original post by Arsey)
Check out my revision thread on D1. Do the practice papers, particularly B.

I also uploaded all of the old spec papers which I adapted to new spec. Some of those had harder linear programming ones and trickier scheduling.
I will do that! do you think there will be quick sort , they have not asked that in jan and june 2012? Do you think there will be flow charts?

what do u think about c3
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6 years ago
#195
Dayummmmmmm, I failed.
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6 years ago
#196
Well, I expected the paper to be harder than this tbh..
Only question i found tough was the games one with the tree diagram - messed that one up nicely. Also a few stupid marks here and there..

Overall, a pretty nice paper compared to others..
2
6 years ago
#197
Thank you so much, that made my day, did much better than expected, some questions were nothing like the past exams!
0
6 years ago
#198
for the last question to work otu the probability of B and C, i did the probability of B and A' x probabilty C?
why is that wrong.... because a and C are mutually exclusive????
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#199
(Original post by otrivine)
I will do that! do you think there will be quick sort , they have not asked that in jan and june 2012? Do you think there will be flow charts?

what do u think about c3
good call, binary search perhaps. Full bin packing.

Differences between Prim's and Dikky. Prim's on a matrix
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6 years ago
#200
(Original post by Arsey)
good call, binary search perhaps. Full bin packing.

Differences between Prim's and Dikky. Prim's on a matrix
True! thanks, what about flow chart or is that easy ?
0
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