Lorenzo looked at a chart of the record high temperatures in North America by country/region. The coldest record high temperature is from Greenland at 86.2°F, and the hottest is from the United States at 134°F. The median record high temperature is 101.25°F, and the interquartile range is 17.25°F. All the record temperatures sounded very hot to Lorenzo, whose hometown high temperature that day was 12°F.
Which is a measure of how much the record high temperatures vary?