An integrated circuit manufacturer produces wafers that contain 18 chips. Each chip has a probability of 0.085 of not being placed quite correctly on the wafer.
(a) Find the probability that a wafer contains at least three incorrectly placed chips.
(b) What is the probability that a wafer contains no more than one incorrectly placed chip?
(c) What is the expected number of incorrectly placed chips on a wafer'.'