Posted by **Sharon** on Monday, July 25, 2011 at 7:12am.

The average marks of 30 students in mathematics is 69. If the class leader’s mark is included then the average becomes 70. Find the class leader’s mark.

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**PsyDAG**, Monday, July 25, 2011 at 11:48am
69 = Σx/30

70 = Σx/31

Solve each for Σx, then subtract one from the other.

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