If a seed is planted, it has a 80% chance of growing into a healthy plant. If eight seeds are planted, what is the probability that exactly 3 don't grow? When doing blood testing for a viral infection, the procedure can be made more efficient and less expensive by combining partial samples of different blood specimens. If samples from three people are combined and the mixture test negative, we know that all three individual samples are negative. Find the probability of a positive result for three samples combined into one mixture assuming the probability of a individual blood sample testing positive for the virus is 0.11. A manufacturing machine has 9% defect rate. If three items are chosen at random, what is the probability that at least one will have a defect? I changed the numbers on these questions but phrased them the same as the questions on my assignment. This assignment is due in less that 20 minutes. Please help me understand