AC Lim's answer to Santhosh's Primary 5 Maths Whole Numbers Singapore question.
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Marks recorded wrong were 50 and 70
Actual marks were 80 and 60
Total marks as recorded wrongly
= 40 x 85
= 3400
Actual total = 3400-50-70+80+60
= 3420
Actual average = 3420 / 40 = 85.5 marks
Hope this helps
Actual marks were 80 and 60
Total marks as recorded wrongly
= 40 x 85
= 3400
Actual total = 3400-50-70+80+60
= 3420
Actual average = 3420 / 40 = 85.5 marks
Hope this helps
Date Posted:
4 years ago
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