The speeds of car traveling on Interstate Highway I-35 are normally distributed with a mean of...

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The speeds of car traveling on Interstate Highway I-35are normally distributed with a mean of 74
miles per hour and a standard deviation of 6 miles per hour.
(a) Find the percentage of the cars traveling on this highway witha speed
i. of more than 85,
ii. between 65 to 72.
(b) If a BMW is at the speed that is faster than 90 percentage ofcars, what is the speed of the
BMW?

Answer & Explanation Solved by verified expert
4.5 Ratings (789 Votes)
here the mean speed of car traveling on Interstate Highway I35 74 mphstandard deviation 6 mpha Here if x is the spedd of a random car theni Prx 85 1 Prx 85 1 NORMDISTx 85 74    See Answer
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