A Recent Survey Was Conducted to Compare the Cost of Solar

Multiple Choice

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 $135 and a standard deviation of $11. If the distribution can be considered mound-shaped and symmetric, what percentage of homes will have a monthly utility bill of more than $124?

A) approximately 84%
B) approximately 95%
C) approximately 16%
D) approximately 34%