To find the mean you first have to add up all the numbers then you divide it by how many numbers you have and you got the mean.
Example:
12+13+5=30
30/3=10
10 is the mean
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It is 1 if the two are the only factors.
Two numbers are needed to find a mean.
First,find the mean of the set. Then,find the differences between every item and the mean Square them Find the mean of the squared differences The square root of that is the standard deviation