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October 24, 2014

Homework Help: statistics

Posted by Nesa on Friday, May 11, 2012 at 12:53am.

A construction zone on Kings Road has a posted speed of 45 kilometers per hour. The speeds of vehicle passing through this construction zone are normally distributed with a mean of 46 kilometers per hour and a standard deviation of 4 kilometers per hour. Find the percentage of vehicles passing through this construction that are
i) Exceeding the posted speed limit.
ii) Traveling at speeds between 50 and 55 kilometers per hour

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