The stem-and-leaf plot shows the speeds of the fastest steel roller coasters in Europe. The table shows the speeds of the fastest steel roller coasters in North America.

Question

Speeds of the Fastest Steel Roller Coasters in Europe (in miles per hour)

Stem Leaf
7 4 5 5 5
8 0 0 3 4 8
9 9
11 1

Key: 7|4=74 miles per hour

Speeds of the Fastest Steel Roller Coasters in North America (in miles per hour)

Canada 90 128 91
U.S. 93 120 100
Mexico 95 92 85

Find the range of the speeds of the fastest steel roller coasters on both continents.

Answer 1

The range of the speeds of the fastest steel roller coasters in Europe is 11 - 74 = 63 miles per hour.

To find the range of the speeds of the fastest steel roller coasters in North America, we need to find the highest and lowest speeds. The highest speed is 128 miles per hour (from Canada) and the lowest speed is 85 miles per hour (from Mexico). Therefore, the range is 128 - 85 = 43 miles per hour.

So the range of the speeds of the fastest steel roller coasters on both continents is 63 - 43 = 20 miles per hour.