Find the median of 18, 3, 13, 8, 9, 11, 14 and 9.

10

Arranging the given data in the ascending order:

3, 8, 9, 9, 11, 13, 14 and 15

Total numbers (n) = 8 (i.e. even),

Therefore, we have two middle values: (\(\frac{n}{2}\))th and (\(\frac{n}{2}\) + 1)th observations.

That is (4th and 5th observations): 9 & 11

Thus,

Median of data = Average of 9 and 11 = \(\frac{9 + 11}{2}\) = \(\frac{20}{2}\) = 10