1. Check your school's system for calculating your semester average to determine how many points each letter grade converts to. Most schools give four points for an "A, three
http://www.ehow.com/how_6319315_calculatesemester...

use mean.
http://wiki.answers.com/Q/How_do_you_calculate_you...

The easiest way to calculate batting average is take your total number of hits and divide it by the total amount of times you've been at bat. There are other factors to take into
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Use algebra to calculate it. Assuming you want a 90 minimum. x is the grade you need to get on your final. (4)94) + (4)93) + (2)X = 90. Solving for x. 90  (4)94)  (4)94) = 15.2.
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