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October 2, 2014

October 2, 2014

Posted by **John** on Monday, January 26, 2009 at 12:29am.

- Math -
**Reiny**, Monday, January 26, 2009 at 8:32amtotal marks of students in period 1 = 86*15 = 1290

total marks of students in period 2 = 88*21 = 1748

total marks of students in period 3 = 95*12 = 1140

add them up, then divide by the total number of students.

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