X 0 1 2 3 4 5 6 7 8
P(x) 0.05 0.1 0.3 0.1 0.1 0.1 0.1 0.1 0.05
=As the manager you check the cashier ( to see if you need to open a new cashier line). What is the probability that you find exactly 2 people waiting in line?
please need to know how to solve it