Marks: --/20 Sunshine Stereo sells cd players. The cd players life is normally distributed with a mean of 2.5 years and a standard deviation of 0.4...

Marks: --/20 Sunshine Stereo sells cd players. The cd players life is normally distributed with a mean of 2.5 years and a standard deviation of 0.4 years. What is the z score for a cd player will break down during the guarantee period of 2 years? (Hint: the statement that the cd player breaks during the 2-year guarantee period means the life is less than 2 years, or x<2. Now find the z score