Two Measures of the Same Spread

A courier records the delivery time, in minutes, of ten parcels dispatched on the same morning:

$42,\; 27,\; 55,\; 33,\; 61,\; 29,\; 48,\; 38,\; 90,\; 36$

For the quartiles, use this convention: sort the data, split it at the median into a lower half and an upper half of equal size, and take $Q1$ and $Q3$ to be the medians of those two halves.

Compute the range and the interquartile range, then report $\text{Range} - \text{IQR}$.

Answer in minutes, rounded to the nearest whole minute.