SOLUTION: The playing life of a Euclid MP3 player is normally distributed with a mean if 30,000 hours and a standard deviation of 500 hours. Matts MP3 player lasted for 31,500 hours. His MP3

Question 970788: The playing life of a Euclid MP3 player is normally distributed with a mean if 30,000 hours and a standard deviation of 500 hours. Matts MP3 player lasted for 31,500 hours. His MP3 Player lasted longer than what percent of other Euclid MP3 players?
1)68%. 2)95%. 3)99.7%. 4)more than 99.8%
I'm actually not sure with one to pick honestly... I need help thank you so much
Answer by reviewermath(1029) (Show Source): You can put this solution on YOUR website!
The playing life of a Euclid MP3 player is normally distributed with a mean if 30,000 hours and a standard deviation of 500 hours. Matts MP3 player lasted for 31,500 hours. His MP3 Player lasted longer than what percent of other Euclid MP3 players?
1)68%. 2)95%. 3)99.7%. 4)more than 99.8%
Solution:
z score =
P(Z < 3) = 0.9987 [4 decimal places]
Therefore, the answer is 4)more than 99.8%
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