By applying the formula we got 738 is median credit score of mary.
The median is the middle number in a sorted, ascending or descending, list of numbers
Given credit score Â
639 732 790 837 677 744 637 821
First we will arrange data in ascending order
so  ascending order is 637,639,677,732,744,790,821,837
Here total number of terms n= 8
which is even
so median is
[tex]\frac{(n/2)^{th } observation+(n/2 +1)^{th} observation )}{2}[/tex]
so median
[tex]=\frac{(8/2)^{th } observation+(8/2 +1)^{th} observation )}{2}\\\\=\frac{(4)^{th } observation+(5)^{th} observation )}{2}\\\\=\frac{732+744}{2}\\\\=\frac{1476}{2}\\\\=738[/tex]
By applying the formula we got 738 is median credit score of mary .
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