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You will end up with a positive number. With integers, if you multiply or divide an even amount of negative numbers, the answer will be positive and if you multiply or divide an odd amount, the answer will be negative.
what you do is you divide 100 by the amount the test was out of then times your answer by your mark
Add them all up and divide by the amount of numbers added together
You add up all of the score/grades and then you divide by the amount of scores/grades total. So if you had 10 scores/grades total you would add them all up and then divide them by 10.
Add up all the numbers and divide by the amount of entries you added together.