If m represents the median and D the mode of the mesurements 5,9,3,5,8 then (M. D) is

First rewrite data from smaller to grater:

5,9,3,5,8 →→ 3,5,5,8,9

Median is the middle term (5) [ 2 terms before & 2 terms after]

Mode is the most repeated term (5 is repeated twice), them (M. D) = (5,5)

Mode = 5

median = 5

M. D = 25