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How are 10 and 20 credit modules weighted?

Let's say we have one student with marks for five modules, with different credit values.

Module

Credit

Mark

Module A

10

44

Module B

20

55

Module C

10

44

Module D

40

66

Module E

40

78

A simple average of the marks, not taking credit weighting into account:

(44 + 55 + 44 + 66 + 78) / 5 = 57.4


To average the module marks more appropriately, first multiply the mark by the credit value:

Module

Credit

Mark

Credit * Mark

Module A

10

44

440

Module B

20

55

1100

Module C

10

44

440

Module D

40

66

2640

Module E

40

78

3120

then sum those values:

440 + 1100 + 440 + 2640 + 3120 = 7740

then divide that by the sum of the credit values:

7740 / 120 = 64.5

  
One can see that this average, 64.5, is greater than the first simple average, 57.4. This is due to those marks in our example for the 20 and 40 credit modules being higher than those for the 10 credit modules. Weighting the module marks in this way gives greater emphasis to the marks for the larger modules.