The life expectancy of Timely brand watches is normally distributed with a mean of four years and a standard deviation of eight months.

A- What is the probability that a randomly selected watch will be in working condition for more than five years?

B-The company has a three-year warranty period on their watches. What percentage of their watches will be in operating condition after the warranty period?

C-What is the minimum and the maximum life expectancy of the middle 95% of the watches?

D-Ninety-five percent of the watches will have a life expectancy of at least how many months?