1. [ If the last digit of your ID is 0 , 1 , 2 , 3 , 4 answer this . Otherwise ignore it ] The length of life of an instrument produced by a machine has a normal distribution with a mean of 12 months and standard deviation of 2 months . Find the probability that an instrument produced by this machine will Last Less than 7 months ?
2. Of 15 rabbits handled by veterinary students, 8 were vaccinated against rabies and 9 were vaccinated against distemper. Of those rabbits vaccinated, 5 were vaccinated against both rabies and distemper. One of the rabbits is to be selected at random. What is the probability that The rabbit was not vaccinated?