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# Have I worked out my overall grade percentage correctly..? watch

1. I had 6 ten credit modules and 3 twenty credit modules.

I added up the 10 credit module percentages: 78+46+58+68+72+50 = 372

Then 372 / 6 = 62

I added up the 20 credit module percentages: 59+60+61 = 180

Then 180 / 3 = 60

So I think these two percentages I’ve been left with are worth 50% each now?

So I did (0.62 x 0.50) + (0.60 x 0.50) = 0.61 so I got 61% overall right?
2. I think so!
3. (Original post by rosie152)
I had 6 ten credit modules and 3 twenty credit modules.

I added up the 10 credit module percentages: 78+46+58+68+72+50 = 372

Then 372 / 6 = 62

I added up the 20 credit module percentages: 59+60+61 = 180

Then 180 / 3 = 60

So I think these two percentages I’ve been left with are worth 50% each now?

So I did (0.62 x 0.50) + (0.60 x 0.50) = 0.61 so I got 61% overall right?
This is correct, but only because six 10 credit modules have the same total value as three 20 credit modules.

If you wanted a more general way of working stuff like this out, for say if you didn't have obvious 50:50 percentages...you could do (sum of[module credit*percentage attained in module])/(total module credits taken).

I.e. in your case (( 78+46+58+68+72+50)x10 +( 59+60+61)*20)/(6x10 + 3x20)=61
4. I did it like this:

You did 120 credits overall.
(74+46+...)*(10/120)=31
(59+60+51)*(20/120)=30
Overall = 31+30 = 61

Basically:
Work out total number of credits
Add up all scores of 10 credit modules. Multiply this number by 10/[total number of credits] = ....
Add up all scores of 20 credit modules. Multiply this number by 20/[total number of credits] = ...
Add up all scores of 30 credit modules. Multiply this number by 30/[total number of credits] = ...
etc
Then add all of the ... numbers up.

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Updated: December 26, 2014
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