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Arsey's S1 Edexcel Answers 18th Jan 2013

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LOL I knw what I did is soooo wrong. I just completely forgot it was a cumulative distribution. Only 2 marks. I just couldn't think of anything.
But I'll still hopefully end up getting around 63/75 after looking at the worked solutions, which will hopefully be an A.

Haha, fair enough, but regardless of whether its cumulative or not, the basic algebra is so off at almost every step that it would be tough to award any marks. And k=13 was printed on the paper, so they might not give you anything for the last line.

Either way I don't want to screw up your hope in future exams, good luck with the rest you have.

Reply 221

Humzah96

Original post by Humzah96

And for getting the width right but the height wrong in historgram how many marks?

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Arsey please answer :smile:

Reply 222

Humzah96

Original post by Humzah96

Ok sorry for being annoying... I got my b value right but switched the bar m and bar t wrong to find a so my end formula was wrong.. Hence the next part being wrong because i used a wrong formula to work out the answer how many marks? Out of 5 in total

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Arsey please answer :smile:

Reply 223

Humzah96

and Arsey for A'|B' would i get a mark for writing A'|B' = A'nB'/B'

Reply 224

.raiden.

Original post by Humzah96

and Arsey for A'|B' would i get a mark for writing A'|B' = A'nB'/B'

Pretty sure you get a mark for that mate, for correct method

Reply 225

.raiden.

Original post by Humzah96

Arsey please answer :smile:

You get error carried forward, so as long as method is correct then you will get all marks for further parts to the question

Reply 226

Humzah96

Original post by raiden95

You get error carried forward, so as long as method is correct then you will get all marks for further parts to the question

Cheers!

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Reply 227

ADayah96

Would I get a mark for writing 'a discrete random variable' for when they ask 'State the name of this probability distribution.'?

Reply 228

TeddyBasherz

Original post by ADayah96

Would I get a mark for writing 'a discrete random variable' for when they ask 'State the name of this probability distribution.'?

No, I made the same mistake. It HAS to be uniform.

Reply 229

Chris-69

Hi Arsey,

Quick question with regards to 4c:

I did P(L>133 | L>127) = P(127< L < 133) / P(L>127)

And then inserted the values. How many marks would this gain me? 1?

Thanks!

(edited 11 years ago)

Reply 230

pilotluke1

For question 6f I multiplied 0.5 by each probability of her winning and added it all together and got seven twelths! I also said which die to pick but not the probability of winning for each die! how many marks?

Reply 231

pilotluke1

Also for 3d i said 'this is reliable because 10 degrees is inside the data range of 8-30 degrees' would i get the mark?

Reply 232

lighterthanAyer

Original post by Arsey

yes

For the probability distribution question, is it ok if I set it out in terms of decimals? So like 0.35 instead of 14/40, 0.175 instead of 7/40 etc. ?

Reply 233

.raiden.

Original post by lighterthanAyer

For the probability distribution question, is it ok if I set it out in terms of decimals? So like 0.35 instead of 14/40, 0.175 instead of 7/40 etc. ?

Without a doubt, it is okay

Reply 234

gooner4ever

Original post by pilotluke1

Also for 3d i said 'this is reliable because 10 degrees is inside the data range of 8-30 degrees' would i get the mark?

Yes of course it's a solid answer

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Reply 235

lighterthanAyer

Original post by raiden95

Without a doubt, it is okay

Phew

Cheers - looking through these unofficial mark schemes is always scary lol

Reply 236

pilotluke1

Original post by gooner4ever

Yes of course it's a solid answer

Posted from TSR Mobile

Thanks!

Posted from TSR Mobile

Reply 237

gooner4ever

Quick question guys do you think I'll lose marks for the probability distribution for B (question 6a) if I wrote the x values of 1 and 3 and 5 separately e.g X 1 1 3 3 5 5 and then the probability of each 1/6 as opposed to what's done in the model answers (joining them all together) ???
cos they way I did it isn't wrong just not well done!

Reply 238

Vorsah

Say if in a question I get part A wrong which is worth 2 marks

Then in part B I use the answer I get in part A to get answer, which is worth 2 marks.

Will I only lose 2 marks for part A, so I would get 2/4 in total?