2. Based on data, the number of motor accidents occurring in an expressway is in the form of Poisson distribution with a mean of 5 motor accidents for every weekend. What is the probability that next weekend there will be: a. no motor accident? b. 4 motor accidents? 3. Based from previous records of a bank operating inside a university campus, a number of students used the ATM following the Poisson distribution with an average of 10 students per day. Find the probability that at a certain day, a. exactly 8 students used the ATM b. at least 6 students used the ATM