A lawn mower manufacturer wants to determine the warranty length for a new model mower whose lifetime is normally distributed with a mean of 8.7 years and a standard deviation of 1.9 years. How long should the warranty last so that no more than 3% of the mowers will have to be replaced?
A. 5.5 years
B. 5.9 years
C. 5.7 years
D. 5.3 years
E. 5.1 years