In the rainfall data for 14 Kerala districts during a week of September 2015, the value 89.0 mm (Thiruvananthapuram) is much larger than other entries. The unit notes that this kind of single large value:

1. The mean adds all values and divides by the count; an unusually large value adds disproportionately. 2. The median depends only on rank, not magnitude, of the values. 3. So a single large outlier raises the mean noticeably but leaves the median almost unchanged. 4. As a result the mean ends up larger than the median in such distributions. 5. So one large value pulls the mean upward, above the median. _Source: SCERT Kerala Std X Mathematics Part-2, Chapter 9-11 (pp 227-246, 2019 ed.)._