You take the sum of all those numbers, then divide that number by how many numbers there are. For example: 300,16,27,and 4..add them all up 300+16+27+4=347. then you divide 347 by 4(since there are four numbers that you have to add together) and you get 86.75.
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multiply the mean by the amount of numbers
The mean is when you calculate the sum of a list of numbers and then you didvide by the number of numbers in the list.
Given a set of numbers, and its mean, we can find the difference between each of the numbers and the mean. If we take the mean of these differences, the result is called the mean deviation of the numbers.
Mark up would mean to add. Mark down would mean to subtract.
You add the two numbers together, then divide the sum by two.