The time (in minutes) between telephone calls at an insurance claims office has the expo- nential probability distribution: f(x) = 0.50e ( to the -0.50x power) for x (>or equal to) 0
a. What is the mean time between telephone calls?
b. What is the probability of 30 seconds or less between telephone calls?
c. What is the probability of 1 minute or less between telephone calls?
d. What is the probability of 5 or more minutes without a telephone call?