Normal distribution

Statistics
Tutor: None Selected Time limit: 1 Day

the Dmv reports that the average   Of a vehicle is 9 years old (108 months). Assume that the distribution of vehicle ages is normally distributed with a standard deviation of 18 months. What percent of vehicles are more than 12 years old (144 months). Give your answer as a decimal rounded to four decimal places.

Mar 13th, 2015

z value = (144-108)/18 =36/18 = 2

P(z>2) =1-0.97725 = 0.02275 or 0.0228

Answer : 2.28%

Mar 14th, 2015

Are you studying on the go? Check out our FREE app and post questions on the fly!
Download on the
App Store
...
Mar 13th, 2015
...
Mar 13th, 2015
Dec 9th, 2016
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer