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# Calculating UMS watch

1. There must be someone who can help me untangle the enigma of UMS...

Taking 2014 OCR English Literature as an example:

Say I got a mark of 55 in F661, how would I convert that to UMS?

I tried working out the difference between an A and a B in raw marks (54-46=8) and, as each grade is separated by 10% UMS, calculated that 1 mark is equal to 1.25% (8/10 = 1.25), which equates to 1.5 UMS (0.0125 x 120 = 1.5).

As I got 1 mark above the A boundary, this would mean I have a UMS of 97.5 (96 + 1.25 = 97.5)

However, if I did the same calculation with a mark of 60 (full marks), this would equate to just 105 UMS ((1.25 x 6) + 96), but full marks MUST be 120 UMS. So am I barking up the wrong tree? If so, how on God's earth do you do this?

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2. (Original post by Kid B)
There must be someone who can help me untangle the enigma of UMS...

Taking 2014 OCR English Literature as an example:

Say I got a mark of 55 in F661, how would I convert that to UMS?

I tried working out the difference between an A and a B in raw marks (54-46=8) and, as each grade is separated by 10% UMS, calculated that 1 mark is equal to 1.25% (8/10 = 1.25), which equates to 1.5 UMS (0.0125 x 120 = 1.5).

As I got 1 mark above the A boundary, this would mean I have a UMS of 97.5 (96 + 1.25 = 97.5)

However, if I did the same calculation with a mark of 60 (full marks), this would equate to just 105 UMS ((1.25 x 6) + 96), but full marks MUST be 120 UMS. So am I barking up the wrong tree? If so, how on God's earth do you do this?

As far as I know full UMS does not necessarily mean full marks. You can still achieve full UMS without attaining full marks in an exam. At least that's the case with AQA anyway

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3. (Original post by jasskaurr11)
As far as I know full UMS does not necessarily mean full marks. You can still achieve full UMS without attaining full marks in an exam. At least that's the case with AQA anyway

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Thanks - I know you can get full UMS without getting full marks (although I don't believe that's the case with English Lit), but what I mean is full marks must be full UMS.

You can't get 60/60 raw and not have full UMS.
4. (Original post by Kid B)
There must be someone who can help me untangle the enigma of UMS...

Taking 2014 OCR English Literature as an example:

Say I got a mark of 55 in F661, how would I convert that to UMS?

I tried working out the difference between an A and a B in raw marks (54-46=8) and, as each grade is separated by 10% UMS, calculated that 1 mark is equal to 1.25% (8/10 = 1.25), which equates to 1.5 UMS (0.0125 x 120 = 1.5).

As I got 1 mark above the A boundary, this would mean I have a UMS of 97.5 (96 + 1.25 = 97.5)

However, if I did the same calculation with a mark of 60 (full marks), this would equate to just 105 UMS ((1.25 x 6) + 96), but full marks MUST be 120 UMS. So am I barking up the wrong tree? If so, how on God's earth do you do this?

Usually you can just linearly extrapolate the difference of the A and B grade throughout the raw to UMS conversion upto full ums as you have done.

However, if the a grade is so high that extrapolating the difference will cause the full ums to require more than 100% raw marks (in this case extrapolating would mean 70/60 is needed for 120 ums, which is clearly impossible) then you have to use a different system.

The A* (90% ums mark) is placed half way between 100% ums and the A grade so in this case 108 ums is 57/60 raw. Therefore 55/60 raw is 100 ums.

Hope that sort of makes sense
5. (Original post by philgreek)
Usually you can just linearly extrapolate the difference of the A and B grade throughout the raw to UMS conversion upto full ums as you have done.

However, if the a grade is so high that extrapolating the difference will cause the full ums to require more than 100% raw marks (in this case extrapolating would mean 70/60 is needed for 120 ums, which is clearly impossible) then you have to use a different system.

The A* (90% ums mark) is placed half way between 100% ums and the A grade so in this case 108 ums is 57/60 raw. Therefore 55/60 raw is 100 ums.

Hope that sort of makes sense
Okay! Thanks a lot

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Updated: May 15, 2015
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