(Solved): please answer all A digital GPS watch has a useful battery life that can be modeled by a normal dist ...

A digital GPS watch has a useful battery life that can be modeled by a normal distribution with a mean of 4 years and a standard deviation of fifteen (15) months. Considering this information, determine the percentage of GPS watches that can be expected to fail in the following time periods: (Refer to Table of Values) (Work to 3 decimal places) 2.1 Within + 4 months of the mean life (3) 2.2 Before 42 months of service (2) 2.3 After 54 months of service (2) 2.4 Between 42 and 54 months of service (1) 2.5 What service life would achieve an expected wear-out rate of 2.5.1 78% (2) 2.5.2 10 % (2) [12]