The average travel time to work for a person living and working inKokomo, Indiana is 17 minutes. Suppose the standard deviation of travel time to work is 4.5 minutes and the distribution of travel time is approximately normally distributed.

Which of these statements is asking for a measurement(i.e. is an inverse normalquestion)?

A.

What percentage of people living and working in Kokomo have a travel time to work that is between thirteen and fifteenminutes?

B.

If15% of people living and working in Kokomo have travel time to work that is below a certain number ofminutes, how many minutes would thatbe?

Use the empirical rule to solve the problem.

At onecollege, GPA's are normally distributed with a mean of 2.9 and a standard deviation of 0.5. What percentage of students at the college have a GPA between 2.4 and 3.4? Round to the nearest percent.

A.

Almost all

B.

68%

C.

84%

D.

95%

Use the empirical rule to solve the problem.

The amount ofJen's monthly phone bill is normally distributed with a mean of $55 and a standard deviation of $9. What percentage of her phone bills are between $28 and $82?

A.

Almost all

B.

68%

C.

95%

D.

50%

Use the empirical rule to solve the problem.

Solar energy is considered by many to be the energy of the future. A recent survey was taken to compare the cost of solar energy to the cost of gas or electric energy. Results of the survey revealed that the distribution of the amount of the monthly utility bill of a3-bedroom house using gas or electric energy had a mean of $126 and a standard deviation of $14. If the distribution isnormal, what percentage of homes will have a monthly utility bill of more than $112?

A.

approximately95%

B.

approximately32%

C.

approximately84%

D.

approximately16%