15, 6, 16, 8, 22, 21, 9, 18, 25
First we have to arrange given data into ascending order
6, 8, 9, 15, 16, 18, 21, 22, 25
Given number of observations, n = 9 (odd)
Therefore median = ((n+1)/2)th term
Median = value of 5th term
= 16
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