A recent survey was conducted 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 a 3-bedroom house using gas or electric energy had a mean of $100 and a standard deviation of $14. Three solar homes reported monthly utility bills of $51, $48, and $56. Which of the following statements is true?
A) The utility bills for homes using solar power are about the same as those for homes using only gas and electricity.
B) Homes using solar power may have lower utility bills than homes using only gas and electricity.
C) Homes using solar power may actually have higher utility bills than homes using only gas and electricity.
D) Homes using solar power always have lower utility bills than homes using only gas and electricity.

Question

Quizplus · Accepted Answer

The average utility bill for the solar homes ($51, $48, $56) is lower than the mean utility bill for homes using gas or electric energy ($100), suggesting that solar homes may have lower utility bills.

A Recent Survey Was Conducted to Compare the Cost of Solar