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To find the mean of the set first add the members together.
The mean (average) of the set is found by dividing the sum of its members by the number of the members, in this case .

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40+45+56=141
To find the mean of the set 40,45,56 first add the members together.
\frac{141}{3}=47
The mean (average) of the set 40,45,56 is found by dividing the sum of its members by the number of the members, in this case 3.
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