Answers

2014-02-16T19:47:45+08:00
Class mark is the midpoint between the two boundaries.. let me set an example:
41 - 45 the formula would be: (41+45) divided by 2.. then the answer is the class mark.

here is the complete data:
Score        Class Mark
41 - 45           43
36 - 40           38
31 - 35           33
26 - 30           28
21 - 25           23
16 - 20           18

Source: lecture of our mathematics teacher (Sir Javez)
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