Random number A is distributed exponentially with a mean of 4. Random number B is also exponential, with a mean 1. What is the probability that A is less than B? To make sure I understand...A detailed explanation would be appreciated. Solution use that z = lambdaA A/(lambdaB B) = 1/4 A/B has a distribution of f= 1/(z+1)^2 we want to know if A.