17 A major television manufacturer has determined that its 40-inch LED televisions have a mean service life that can be modeled by a normal distribution with a mean of six years and a standard deviation of one-half year. 9912 .so a. What probability can you assign to service lives of at least (1) five years? (2) six years? (3) seven and one-half years? .001s b. If the manufacturer offers service contracts of four years on these televisions what percentage can be expected to fail from wear-out during the service period