2. A manufacturing plant uses a specific bulk product. The amount of product used in one day can be modeled by an exponential distribution with B = 6 (measurements in tons). (a) (5 pts) Find the probability that the plant will use more than 4 tons on a given day. You must integrate the exponential pdf to find your answer and show your work. (b) (2 pts) Calculate the mean and variance of this exponential distribution