allerySix students average 70 marks. Five of them total 340 marks. What did the sixth student score?
A70
B75
C80
D85
Answer & Solution
Correct answer: C. 80
1. All six together scored 70 x 6 = 420 marks.
2. Five of them scored 340 marks.
3. The sixth scored 420 - 340 = 80 marks.
70 would only be right if all five also averaged 70, which gives 350, not 340.
_Source: Wikipedia, Arithmetic mean, Definition_
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