# 25th and 75th percentile according to wolfram alpha

I'm just studying my statistics exams and I came across something odd.

When I try to get the 25th or 75th percentile with wolfram alpha, it gives me another answer than I should get according to my textbooks.

according to my textbook, the answer should actually be 37 and not 39.5

Does anyone have any idea what wolfram alpha does different?

• – Henry Dec 13 '11 at 23:09