Hi, need help with this 2 questions.

1. The life expectancy of Timely brand watches is normally distributed with a mean of four years and a standard deviation of 0. 7year. (5 Points) (a) What is the probability that a randomly selected watch will be in working condition for more than five years? (b) 95% of the watches will have a life expectancy of at least how many years? 2. The life expectancy in the United States is 75 years with a standard deviation of 7 years. A random sample of 49 individuals is selected. (5 Points) (a) What is the probability that the sample mean will be larger than 77 years? (b) What is the probability that the sample mean will be between 73.5 and 76 years