. A lawnmower manufacturing company has a policy that it will repair free of charge any lawnmower manufactured by them if it breaks down within one year of purchase. Suppose the length of time a lawnmower works without needing repairs is normally distributed with a mean time of 4.8 years and a standard deviation of 1.8 years. a. What percentage of lawnmowers will require the free repair? (break down within one year) b. If a lawnmower is in the 99th percentile, how long will it work without needing repairs?