SOLUTION: A tire manufacturer advertises that their radial tire has a distribution that is normal with a mean of 60,000 miles and a standard deviation of 6,000 miles. What is the percentage

Algebra ->  Probability-and-statistics -> SOLUTION: A tire manufacturer advertises that their radial tire has a distribution that is normal with a mean of 60,000 miles and a standard deviation of 6,000 miles. What is the percentage       Log On


   

Question 324484: A tire manufacturer advertises that their radial tire has a distribution that is normal with a mean of 60,000 miles and a standard deviation of 6,000 miles. What is the percentage of their tires will travel less than 66,000 miles before wearing out?
a. 15.87%
b. 53.98%
c. 46.02%
d. 84.13%
e. 90.91%
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Find the z score.
z=%2866000-60000%29%2F6000=1
Find the associated probability.
P%28z=1%29=0.8413
d) is the correct answer.