Olivia wants to obtain a systematic sample of size 40 from a population of 2000 competitors in a race. She numbers the competitors from 1 to 2000 and uses, as a starting point, competitor number 11. Circle the correct competitor number of the next person in her sample.

Systematic sampling involves selecting items from an ordered population using a fixed, periodic interval. \n1. Calculate the sampling interval (k): k = Population size / Sample size = 2000 / 40 = 50. \n2. The starting point is given as competitor number 11. \n3. To find the next person in the sample, add the interval to the starting point: Next number = 11 + 50 = 61. The sample would consist of competitors 11, 61, 111, 161, and so on.