The rainfall (in mm) recorded at a hill station on six days was 16, 5, $x$, 20, 9 and 12. The mean rainfall for the six days was 12 mm. What was the median rainfall?

Explanation

1. 01

   Total = $6 \times 12 = 72$, and the known values add to 62, so $x = 10$.

2. 02

   Sorted: 5, 9, 10, 12, 16, 20.

3. 03

   Median = $\frac{10 + 12}{2} = 11$ mm.