To estimate the number of people in Springfield, population 10,000, who have a swimming pool in their backyard, 250 people were interviewed. Of those polled, 119 had a swimming pool. How many people in the city might one expect to have a swimming pool? (Round to the nearest whole number, if necessary.)

In the sample, 119 out of 250 people had a swimming pool, so the estimated proportion is 119 ÷ 250 = 0.476. Apply that proportion to Springfield’s population: 0.476 × 10,000 = 4,760. Thus, about 4,760 people might have a swimming pool; this is choice a.

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