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
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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