Explain it

4. In recent years, an average of 6.4 children per year have gotten sick with measles in Minnesota. If a recent year is taken at random, what is the probability that at most two children got sick with measles in Minnesota? [2] 5. 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 between 5 to 12 months? [2] 6. In testing a certain kind of truck over rough terrain, it is found that 35% of the front wheel tires have a blowout. What is the probability that of the next five trucks tested, three tires will blowout? [2]