A real estate agent claims that all things being equal, houses with swimming pools tend to sell for less than those without swimming pools. What does this statement mean? 

a. There are fewer homes with swimming pools than without. 

b. The typical price for homes with pools is smaller than the typical price for homes without pools. 

c. There’s more variability in the price of homes with pools than in the price of those without. 

d. The most expensive houses sold do not have pools.