An XM-1 tank has a MTBF of 810 kilometers. Assuming an exponential distribution: (a) What is the maximum mission length such that there will be a 0.98 chance of the tank returning? (b) What is the probability of the tank returning from a 160 kilometer mission? (c) How many tanks should be sent out on the 160 kilometer mission to obtain a probability of 0.99 that at least five tanks will arrive at the target area (assume 80 kilometers to target). Solution if no one answer pls rate me :) ty.