Question

How is the interquartile range calculated? HELP WITH APEX PLEASE!

Answer 1

By definition the interquartile range or IQR is obtained when the 25th percentile or $Q_{1}$ is subtracted from the 75th percentile or $Q_{3}$.

Thus, from the above definition, the formula for IQR is:

$IQR=Q_{3}-Q_{1}$

As we can see from the provided options that the definition of IQR matches the expression provided in Option A and thus, Option A is the correct answer.

Answer 2

Quartile 3 (Q3) minus quartile 1 (Q1) is right for apex.