please answer 3.19

3.19 A pump used in a water ltration system operates continuously. It has experienced frequent failures as a result of abnormally heavy loads occurring at random times. Its CDF has been found to be F(t) = 1_e:/1000;t 2 0 where t is measured in days. If it has been operating without failure for the last 90 days, what is the probability it will fail within the next 90 days