Question 1077813
there is more than one definition for quartiles.  Here, there is a median, so remove it and take the middle of the lower and upper three: that would be 1540 and 2000 for Q1 and Q3.  Q2, the median is 1580.

Others take the number of items and divide by 4, so 7/4 would be 3/4 of the way from the first to the second.  

I prefer taking the median of the lower half for Q1 and upper half for Q3.  The way you are doing it is taking the median of the lower 4 and the median of the upper 2, and that would not be correct.  Take the median of the distribution.  Then take the median of that.  This is always defensible.