In statistics, what is the median of the ordered dataset ${3, 5, 7, 9, 11, 13}$ ?

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In algebra, what are the roots of the quadratic equation $x^{2} - 7 x + 10 = 0$ ?
In algebra, what is the value of $lo g_{3} (81)$ ?
In algebra, what is the solution set of the linear inequality $4 - 2 x \geq 10$ ?
In algebra, what is the 10th term of an arithmetic progression with first term $a_{1} = 3$ and common difference $d = 4$ ?
In algebra, what is the 6th term of a geometric progression with first term $b_{1} = 3$ and common ratio $q = 2$ ?
In algebra, what is the domain of the real-valued function $f (x) = 2 x - 8$ ?