Question

What are the mean, median, mode and range of the data set given the altitude of lakes in feet: -12, -9, -14, -39, -49, -49, -18, and -43?

Answer 1

So where is your attempt to do this?

Is there something about it you do not know how to do?
Step one I would put the data in ascending order
-49, -49, -43, -39, etc ..... -9
I notice right off that there are two -49s and the data ranges from - 49 to -9