In: Statistics and Probability
The miles per gallon ratings for 2001 model year vehicles vary according to an approximately Normal distribution with mean μ = 22.35 miles per gallon and standard deviation σ = 5.29 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 12.74?
_________%