The gasoline mileages for city driving obtained by drivers of a certain brand of compact car are normally distributed with

m.p.g. and S_X= 2.3 m.p.g. What proportion of drivers obtain:
(a)less than 23 m.p.g.?
(b)less than 30 m.p.g.?
(c)between 25 and 30 m.p.g.?
(d)between 28 and 32 m.p.g.?

Question

The gasoline mileages for city driving obtained by drivers of a certain brand of compact car are normally distributed with

m.p.g. and S_X= 2.3 m.p.g. What proportion of drivers obtain:
(a)less than 23 m.p.g.?
(b)less than 30 m.p.g.?
(c)between 25 and 30 m.p.g.?
(d)between 28 and 32 m.p.g.?

Quizplus · Accepted Answer

The Answer is (a).0375
(b).8962
(c).7148
(d).3317.

The Gasoline Mileages for City Driving Obtained by Drivers of a Certain