Work Out My UMS, please? Any mathematicians who know what standard deviation is? Watch

annarchy
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Hi there,

is it possible for you to work out my final Chem A level grade if I give you these numbers using standard deviation or do you need the results from everyone to do a standard deviation calc? Can you guess anyway?

1. 82/90
2. 80/90
3. 87/120

4. 42/70
5. 35/70
6. 81/100 (6B and my pred. lowest mark for synoptic)

It needs to make up 600 total if that helps


Apparently around 50/75 raw marks in biology will give you 80% UMS(an A)...where as in maths(i don't have the stats for Chemistry) around 60/75 raw marks is more likely to give you 80% UMS (it varies with different modules though of course).
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secretmessages
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What are the figures you gave? Module marks, or UMS scores?
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Kyle_S-C
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It'll require a distribution based on everybody's results, not just yours, so nobody can tell you really.

However, based on that you got 407/540 (doesn't add up to 600) which is 75%.
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Hopping Mad Kangaroo
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It wouldnt involve standard deviation. But at a guess (assuming that we have 300 points a year):
AS: 82+80+87

A2: 9/7 * (42+35) + 12/10 * 81

Now do it to get roughly your total score.
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IanDangerously
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A standard deviation is a quantitative measure of the distribution of data values in a data series.

And also those marks you provided dont work, with that logic (90 + 90 + 120 + 70 + 70 + 100) would be a maximum of 540 possible marks not 600. Sure the units 4, 5 and 6 werent meant to be 90, 90, 120 as well?


Oh and you cant calculate UMS marks because the UMS is dependant on fitting the results of every candidate in the country who sat the course into the normal distribution curve using standard deviation. You can look at past UMS boundaries to get some rough idea of what itll be though.
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secretmessages
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I'm under the impression the OP has provided module marks, which do not need to add up to 600. In that case, we'd need to know the exam weightings to estimate how many UMS marks have been achieved. Even then, it's impossible, because grade boundaries change every year.
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annarchy
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Can you give me a rough guess?
75%, so that's a B more or less


(Original post by secretmessages)
What are the figures you gave? Module marks, or UMS scores?
these are my scores out of the number of marks written on the exam paper.

Thanks so far
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Hopping Mad Kangaroo
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(Original post by IanDangerously)
A standard deviation is a quantitative measure of the distribution of data values in a data series.

And also those marks you provided dont work, with that logic (90 + 90 + 120 + 70 + 70 + 100) would be a maximum of 540 possible marks not 600. Sure the units 4, 5 and 6 werent meant to be 90, 90, 120 as well?


Oh and you cant calculate UMS marks because the UMS is dependant on fitting the results of every candidate in the country who sat the course into the normal distribution curve using standard deviation. You can look at past UMS boundaries to get some rough idea of what itll be though.
I scaled the last lot of marks up to the relavant scores for the OP. Though i havent got a calculator to finish the job to hand...
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annarchy
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Ohhhh Ok, I understand what standard deviation is, so it's pretty much impossible to tell what my grade is, even though you can estimate my UMS... Against a set of data... Right I see (I am v glad I didn't do maths, too)..



Have any of you done A-levels? Do you know what UMSs you got vs your grade? I just need an indication of whether or not there is any point in even continuing trying if I have no shot at ABB, so I'm trying to get some kind of idea..
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saxabojed
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Its all hypothetical anyway, as exam boards, and the government, yes them, well the dept of education/whatever its called these days, sit down and work out a scale which will allow a certain number that year to get A, all the way down to U, this is what people mean when they talk about scaling of marks.

Your best bet would be too look at the UMS to RAW marks for the past say 5 years and average them.

For example on the physics synoptic which I've been looking at its, 64% to get a UMS % of 80, sounds easy when you put it like that doesn't it
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saxabojed
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If out of what you have done, your total raw marks divided by the total avalible raw marks is around 75%, then your pretty on track for a B, most scales make marks go up, so in real terms this may improve to around say 78% if its been a perticularly hard set of papers you may even see 80%, but that would be extremly rare.

Hope this helps
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annarchy
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^^^ THANK YOU! Ah that is good to hear. Rep for you my friend.

It might be 75, 75, 150

... Yes it is, sorry.

in which case I think I got

4. 37
5. 41
6. 118
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annarchy
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This is a wee bit too much concept for me. Going to read my pop-up books, thanks for your help though. I have a kind of idea I might be in the B/C region

I DAMN well hope people failed it worse than me. The Chemistry board on TSR isn't helping though. >;[
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saxabojed
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Yep, based on that your on 74% give or take a few, so if you think you got that and all your exams are done, then you've in all reality (with those marks) got yourself a reasonable B
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harkyb
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you didng even give what board it is? Just check wat the Raw Marks > UMS conversion has been in the past using grade boundaries in examiners reports from the board's websites. Then on average you can see what grade your looking at, there wont be a big difference.
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IanDangerously
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Go to the exam board website and look up the Ums-raw conversion for the last exam.

Then look at how many Raw marks you think you got, and use the table to turn it into an approximate UMS, then add all of them up, take the number you get and compare it to this below to give you your grade:


A = 480
B = 420
C = 360
D = 300
E = 240
U = <240

P.s if you state which papers you sat, which subject and which exam board ill go through the past raw:ums conversions and try and come up with an estimate if thatd help.
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annarchy
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(Original post by IanDangerously)
Go to the exam board website and look up the Ums-raw conversion for the last exam.

Then look at how many Raw marks you think you got, and use the table to turn it into an approximate UMS, then add all of them up, take the number you get and compare it to this below to give you your grade:


A = 480
B = 420
C = 360
D = 300
E = 240
U = <240

P.s if you state which papers you sat, which subject and which exam board ill go through the past raw:ums conversions and try and come up with an estimate if thatd help.
Oh, many thanks! I have absolutely no idea how to do this, I looked at it on the site but what on earth does 24*^7 mean?! So I've come to ask the experts... it'd be greeeat if you could convert this for me, thankyouu

These are Edexcel GCE Chemistry I have the paper numbers here now,

1. 6241/01 - raw: 82/90
2. 6242/01 - raw: 80/90
3. 6243/01 - raw: 87/120

4. 6244/01 - raw: 37/75
5. 6245/01 - raw: 41/75
6. 6246/01B & 02 - raw: 118/150 [2 different papers but one unit for this one]

thank you so much ^_^
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IanDangerously
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(Original post by annarchy)
Oh, many thanks! I have absolutely no idea how to do this, I looked at it on the site but what on earth does 24*^7 mean?! So I've come to ask the experts... it'd be greeeat if you could convert this for me, thankyouu

These are Edexcel GCE Chemistry I have the paper numbers here now,

1. 6241/01 - raw: 82/90
2. 6242/01 - raw: 80/90
3. 6243/01 - raw: 87/120

4. 6244/01 - raw: 37/75
5. 6245/01 - raw: 41/75
6. 6246/01B & 02 - raw: 118/150 [2 different papers but one unit for this one]

thank you so much ^_^
The Edexcel examiners report with the stastics in lists the maximum raw marks as being different to what you got.

According to the exam board, paper 6241/01 and 6242/01 are out of 60, and 6243/01 is out of 100. Are you sure those marks you have arent already in UMS form (the UMS's are out of 90, 90 and 120). Also the 6246/01B practical is listed as out of 100 Raw. Until we figure out why you have different total raw marks to the exam boards markscheme, Im kinda stuck.


Anyway what I can work out for now:
For 6244/01 in June last year, 37/75 raw marks equalled approximately 43/90
For 6245/01 in June last year, 41/75 raw marks equalled approximately 55/90

If you can just check over those results and post back I'll be able to continue
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annarchy
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(Original post by IanDangerously)
The Edexcel examiners report with the stastics in lists the maximum raw marks as being different to what you got.

According to the exam board, paper 6241/01 and 6242/01 are out of 60, and 6243/01 is out of 100. Are you sure those marks you have arent already in UMS form (the UMS's are out of 90, 90 and 120). Also the 6246/01B practical is listed as out of 100 Raw. Until we figure out why you have different total raw marks to the exam boards markscheme, Im kinda stuck.


Anyway what I can work out for now:
For 6244/01 in June last year, 37/75 raw marks equalled approximately 43/90
For 6245/01 in June last year, 41/75 raw marks equalled approximately 55/90

If you can just check over those results and post back I'll be able to continue
Oops, sorry; the first 3 are in UMS form and 4,5,6 are all raw marks.
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saxabojed
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Ahh, that means my prediction is probably incorrect then. Sorry
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