The lifetime of a battery in a certain application is normally distributed with mean = 16

Question:

The lifetime of a battery in a certain application is normally distributed with mean μ = 16 hours and standard deviation σ = 2 hours.
a. What is the probability that a battery will last more than 19 hours?
b. Find the 10th percentile of the lifetimes.
c. A particular battery lasts 14.5 hours. What percentile is its lifetime on?
d. What is the probability that the lifetime of a battery is between 14.5 and 17 hours?