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.

statistics  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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