book Maths Puzzle Numerical Ability

Can you tell me if this is true or false
THe median of a data set is always one of the data values

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book Other Question

The number of milk cows y(in thousands) on farms in the United States for the year x from 1970 through 1995 (x=0 represents 1980), can be modeled by the linear equation 107x+y=11,0 how do you factor a binomial that has no common factors and are not perfect squares?
For example- how would you factor
4m^2+7m or
7m^2-4m