I know that it is 1- e^() but I do not know how to plug it in. I need some help trying to figure it out and also what is the next step.

The time (in minutes) between telephone calls at an insurance claims ofce has the exponential probability distribution: f(a:) = 0.405'0'407' for x 2 0 a. what is the mean time between telephone calls? Mean time (u) = E] v/ minutes b. What is the probability of 36 seconds or less between telephone calls? (Note: 36 seconds = 0.60 minutes) If required, round your answer to four decimal places. P(x 5 0.60) = C] c. what is the probability of 3 minute or less between telephone calls? If required, round your answer to four decimal places. mst d. what is the probability of 6 or more minutes without a telephone call? If required, round your answer to four decimal places. \"MHZ