Answer:
median = 4.5
Explanation:
median is the middle value of the data,
to find the median arrange the given set of data into ascending order:
1, 4, 5, 6
as the data set is even in number so take the middle two values, add them and divide by 2 to get the median
thus, median = (4 + 5) / 2 = 9/2 = 4.5