The high temperatures, in degrees Fahrenheit, of 10 U.S. cities during a day in October are listed below.

72, 50, 54, 66, 58, 79, 54, 99, 40, 68

What is the range of the temperatures?

The range of the temperatures is the difference between the highest and lowest temperatures.

First, let's find the highest temperature:
99°F

Now, let's find the lowest temperature:
40°F

The range is calculated by subtracting the lowest temperature from the highest temperature:
99°F - 40°F = 59°F

Therefore, the range of the temperatures is 59°F.