You take all of the grades you receive and add them all together. Then how ever grades are used divide the number of all the added grades to however many grades there are.
Example: 100%, 76%, 89%, 90%, 98%, 99%, 100%, and 67%.
100+76+89+90+98+99+100+67= 719
719 divided by 8= 89.875 or rounded to 90%
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71 percent
add up the three grades then divide by three
17/19 = 89% = B+
do you mean the average height, weight, age or what because usually the average grade of a seventh grader is seventh grade. what are you talking about
[(100x60) + (Tx40)]/100=Average, where T is you average on the other 40% of your grade. Example: your grade average is 90 before the test. You get a 100 on the big test. [(100x60) + 90x40)]/100 = [6000 + 3600]/100 = 96