Asked by Sherina
                A school zone on posted a speed of  50km/hr.The speed of vehicles passing through the school zone are normally distributed with the mean of 56km/hr and a standard deviation of 4km/hr.Find the percentage of vehicle passing through the school zone that are:
a.) Exceeding the posted speed limit
b.) Travelling at speeds between 60km/hr
            
            
        a.) Exceeding the posted speed limit
b.) Travelling at speeds between 60km/hr
Answers
                    Answered by
            oobleck
            
    You can play around with Z table stuff at
davidmlane.com/hyperstat/z_table.html
    
davidmlane.com/hyperstat/z_table.html
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