The miles per gallon ratings for 2001 model year vehicles vary according to an approximately Normal...
The miles per gallon ratings for 2001 model year vehicles vary according to an approximately Normal distribution with mean ? = 20.23 miles per gallon and standard deviation ? = 6.10 miles per gallon.
(a) What percent of vehicles have miles per gallon ratings greater than 28?
(b) What percent of vehicles have miles per gallon ratings between 28 and 31?
(c) What percent of vehicles have miles per gallon ratings less than 12.55?
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