Answer:
0.314 = 31.4% probability that a randomly selected person in this city will have a commute time between 0.4 and 1 hours
Step-by-step explanation:
Exponential distribution:
The exponential probability distribution, with mean m, is described by the following equation:

In which
is the decay parameter.
The probability that x is lower or equal to a is given by:

Which has the following solution:

The probability of finding a value higher than x is:

In this question:

What is the probability that a randomly selected person in this city will have a commute time between 0.4 and 1 hours?

In which


So

0.314 = 31.4% probability that a randomly selected person in this city will have a commute time between 0.4 and 1 hours