The time between the arrival of electronic messages at your computer is exponentially distributed with a mean of four hours.
(a) what is the probability that you do not receive a message during a two-hour period? (round your answer to 3 decimal places.)
(b) if you have not had a message in the last four hours, what is the probability that you do not receive a message in the next two hours? (round your answer to 3 decimal places.)

Ican interpret and represent the remainder in division calculations sensibly for the context (eg 27.4 in calculating average height in cm: $27.44 if it represents an amount of money) solve the following problems. 15) the wildlife park charges $25.50 dollars per person to enter their park if the park made $15096 dollars today, how many people entered the park? 16) ms adams plus 2,230 other keen runners ran a marathon: between them they ran 94817.5km. how many km did each competitor run?