The time it takes a worker on an assembly line to complete a

The time it takes a worker on an assembly line to complete a task is exponentially distributed with a mean of a minutes.

a. What is the probability density function for the time it takes to complete the task?
b. What is the probability that it will take a worker less than b minutes to complete the task?
c. What is the probability that it will take a worker between c and d minutes to complete the task?

Solution