The life expectancy of point-of-sale (POS) terminals is normally distributed with a mean of 4 years and a standard deviation of 10 months.
a. What is the probability that a randomly selected terminal will last more than 5 years?
b. What percentage of terminals will last between 5 and 6 years?
c. What percentage of terminals will last less than 4 years?
d. What percentage of terminals will last between 2.5 and 4.5 years? e. If the manufacturer guarantees the terminals for 3 years (and will replace them if they malfunction), what percentage of terminals will be replaced?