SOLUTION: The number of potholes in any given 1 mile stretch of freeway pavement in Pennsylvania has a bell-shaped distribution. This distribution has a mean of 60 and a standard deviation o
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Question 1206716: The number of potholes in any given 1 mile stretch of freeway pavement in Pennsylvania has a bell-shaped distribution. This distribution has a mean of 60 and a standard deviation of 5. Using the empirical rule, what is the approximate percentage of 1-mile long roadways with potholes numbering between 55 and 70?
Do not enter the percent symbol. Answer by ikleyn(52851) (Show Source):
55 is one standard deviation down from the mean of 60,
while 70 is two standard deviations up from the mean of 60.
So, based on standard rule, the ANSWER is + = 81.5%.
