If mean deviation through median is 15 and median is 450, then coefficient of mean deviation is  

$\textbf{Step 1: Apply the Mean Deviation formula.}$

$\text{Given: Mean deviation through median}=15$

$\text{Median}=450$

$\text{Coefficient of Mean Deviation }$$= \dfrac{Mean\ deviation\ through\ median}{Median}$

$=\dfrac{15}{450}$

$=\dfrac{1}{30}$

$\textbf{Hence, the coefficient of Mean Deviation is }\dfrac{1}{30}.$