The life of sunshine cd players is normally distributed with a mean of 4.2 years and a standard deviation of 1.2 years a CD player is guaranteed for three years we are interested in the length of time...

The life of sunshine cd players is normally distributed with a mean of 4.2 years and a standard deviation of 1.2 years a CD player is guaranteed for three years we are interested in the length of time a cd players last find the 75th percentile of the distribution for that time a CD player last.