The median is the middle number of an ordered series.
So, for number 2, we have, in order:
75, 80, 90, 100, 102, 110.
Because we have two middle numbers (90 and 100), we take the mean between them. So the median is:
The mode of a data set is the one that occurs the most. Here, each number occurs only once. If no numbers occurs more than another, than we say there is no mode, which is the case.