The mean monthly rent and its standard deviation will be affected by the few students with a monthly rent of $1300. The mean would be significant without the outlliers.
To estimate or predict the expect rent of a student, it is best to choose the value from the middle. This gives a close estimate of the likely price of the rent without being affected by the extreme rent prices paid by few students.
Thus, we have interquartile range. It gives you a summary of the minimum, maximum, and average pricing from the data.
The answer is D.
