Average speed on a freeway is  80  mph.   Among all vehicles 65% drive 8 miles above the speed limit of 70 mph.   34 What fraction drive within          ± 5 mph from the mean speed? a 0.7327

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Average speed on a freeway is  80  mph.  
Among all vehicles 65% drive 8 miles above the speed limit of 70 mph.

 

34 What fraction drive within          ± 5 mph from the mean speed?
a 0.7327            
b 0.6978            
c 0.6646            
d 0.6330            
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