3. The manufacturer of a new compact car claims the miles per gallon (mpg) for the gasoline consumption is mound shaped
and symmetric with mean u= 25.9 mpg and standard deviation
o=9.5 mpg. If 30 such cars are tested, what is the probability
the average mpgå is
3.
(a) less than 23 mpg?
(b) more than 28 mpg?
(c) between 23 and 28 mpg?