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Author Question: A traffic study at one point on an interstate highway shows that vehicle speeds are normally ... (Read 74 times)

Melani1276

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on: Jul 24, 2018
A traffic study at one point on an interstate highway shows that vehicle speeds are normally distributed with a mean of 61.3 mph and a standard deviation of 3.3 mph. If a vehicle is randomly checked, find the probability that its speed is between 55.0 mph and 60.0 mph.

Question 2

The mean of a normal probability distribution is 400 and the standard deviation is 10 . About 95 of the observations lie between what two values?


234sdffa

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Reply #1 on: Jul 24, 2018
Answer to Question 1

0.3202

Answer to Question 2

380 and 420


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