For a sample of size N from an exponential distribution with parameter X, find the maximum-likelihood estimator of X. Suppose that X is the intensity per hour of the arrival of cars at a toll booth. If a sample of size ten is taken, with the following amounts of time between arrivals, compute the maximumlikelihood estimate of X.

4361142613 If the cost per hour of maintaining the toll booth can be expressed as X2 -j- 2X + 5, what is the maximum-likelihood estimate of the cost per hour of maintaining the toll booth?