请教数学题中的"range"是什么意思?

查了几个版的数学中英文对照中都没有，但PREP好几道题都是跟这个相关的。

比如

In May, Xiang sold 15 used cars.  For these 15 cars, the range of the selling prices was $15,000 and the lowest selling price was $4,500.  In June, Xiang sold 10 used cars.  For these 10 cars, the range of the selling prices was $16,500 and the lowest selling price was $6,100.  What was the range of the selling prices of the 25 used cars sold by Xiang in May and June?

请教各位大侠了，感谢！

全距=一组数值当中最大的值-最小的值