In the cell where you want the mean to appear, write
=AVERAGE(description of the cells containing the group of numbers)
Or, when you have typed '=AVERAGE(', highlight the cells that you want to be in the set. This is easier instead of typing it in. Remember to close parentheses!
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The mean is 7.375. You can find this by adding all the numbers in the set then dividing the sum by the amount of numbers in the set.
In general, you cannot. You need to know how many numbers there are and then, in only a select few cases can you find the set.
You add All the numbers together and the divide by how many numbers there is.
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.
Count the number of elements in the set - call this number n. Add up all the numbers in the set - call this total t Then mean = t/n