Normal distribution

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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

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Mar 13th, 2015
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Mar 13th, 2015
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