Question

how to find the interquartile range

Answer 1

Take the third quartile minus the first quartile. Finding the third quartile is the same as finding the first you're just looking at the set of data points to the right of the median instead of to the left.

Answer 2

Give this a look
http://en.wikipedia.org/wiki/Interquartile_range#Data_set_in_a_plain-text_box_plot

Answer 3

inter quartile = 3rd quart. -12t quart.

Answer 4

steps to do that : 1- find the median of all data

Answer 5

find the median of the upper data - median of lower data = inter quartile range

Answer 6

hope that helps.