Suppose that the useful life of a particular car battery, measured in months, decays with parameter 0.025. We are interested in the life of the battery.

Give the distribution of

*X*.

*X*~

I believe that is exponential distribution x ~Exp(1/0.025) but one question said Find the probability that a car battery lasts more than 38 months. (Round your answer to four decimal places.) I tried P(x equal or more 38) and use the formula e to the power of -mc an get zero. could someone tell me what I am doing wrong?