m, e, a, n, left parenthesis, 25, comma, 30, right parenthesis

mean(25,30)

Evaluate

\frac{55}{2}=27.5

Factor

\frac{5 \cdot 11}{2} = 27\frac{1}{2} = 27.5

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25+30=55

To find the mean of the set 25,30 first add the members together.

\frac{55}{2}

The mean (average) of the set 25,30 is found by dividing the sum of its members by the number of the members, in this case 2.