Arranging the given data in ascending order :
3, 3, 4, 4, 4, 5, 5
Number of observations, n = 7 (odd number of observations)
∴ Median = (n + 12)th observation
= (7 + 12)th observation
= 4thobservation
= 4
And mode is an observation with highest frequency.
So, mode = 4 (highest frequency)
Thus, according to the option,
Median = Mode = 4.