1.An assembly process has just produced 18 laptop computers. Four of them have a defect of which the manufacturer is unaware. A school has just placed an order for 6 of the 18 computers. What is the probability that 2 of the computers delivered to the school will have defected? 2. Suppose the number of complaints received by a certain hospital from patients is 6.8 every month. Assuming the number of complaints follows the Poisson distribution, determine the probability of receiving less than 2 complaints next month? 3. If a student guesses at random on a 20 question multiple-choice test where each question has 4 choices, what is the probability that the student scores at least 90% on the test? 4. A certain hockey team averages 32.2 shots per 60 min game. Assuming the number of minutes between shots follows the exponential distribution, what is the probability that during a game, the next shot will occur in the next minute