The interquartile range is the difference between the third quartile (Q3) and the first quartile (Q1). If you need a refresher on quartiles, you can take a look at our lesson.

For now, all you need to know is that the first quartile is the value that separates the first 25% of the data from the remaining 75%.

The third quartile is the opposite — it separates the first 75% of the data from the remaining 25%.

The interquartile range is the difference between these two values.

### Instructions

**1.**

We’ve calculated the first quartile of `songs`

and stored it in the variable `q1`

.

Calculate the third quartile and store it in a variable named `q3`

.

To calculate the third quartile, call the same function, but change the second argument to `0.75`

.

**2.**

Now that we have both the first quartile and the third quartile, let’s calculate the IQR.

Create a variable named `interquartile_range`

and set it equal to the difference between `q3`

and `q1`

.