How do you find what the IQR

Bow hello IQR is 21 + 1 - 1 = 21

Find the median (the middle number).

Find both the upper and lower quartile.

Then subtract the upper quartile from the lower quartile and you get the fianl answer.

For example:

1, 12, 16, 23, 34, 54, 72

median: 23

lower quartile: 12

upper quartile: 54

(IQR) interquartile range: 54 - 12 = 42

We get the interquartile range of 42.