Find the median of the following array.7,9,11,13,15,17,19.

The above data is already arranged in ascending order.

Here, the number of observations = 7 (odd)

$\mathrm{median}=\mathrm{value}\mathrm{of}{\left[\frac{\mathrm{n}+1}{2}\right]}^{\mathrm{th}}\mathrm{observation}=\mathrm{value}\mathrm{of}{\left[\frac{7+1}{2}\right]}^{\mathrm{th}}\mathrm{observation}=\mathrm{value}\mathrm{of}{4}^{\mathrm{th}}\mathrm{observation}=13$

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