hours per day. How does this result compare to the value that you obtained using Chebyshev’s theorem in part (a)? 30. The Energy Information Administration reported that the mean retail price per...

hours per day. How does this result compare to the value that you obtained using

Chebyshev’s theorem in part (a)?

30. The Energy Information Administration reported that the mean retail price per gallon of

regular grade gasoline was $2.05 (Energy Information Administration, May 2009).

Suppose that the standard deviation was $.10 and that the retail price per gallon has a bellshaped distribution.

a. What percentage of regular grade gasoline sold between $1.95 and $2.15 per gallon?

b. What percentage of regular grade gasoline sold between $1.95 and $2.25 per gallon?

c. What percentage of regular grade gasoline sold for more than $2.25 per gallon?