In a population of first-year undergraduate students, 12% are international students, 34% live on campus, and 27% are undecided in terms of what to pursue as a major. Further, the average ACT score for this population is 27.9. When a random sample of students is selected from this population, the average ACT score for the sample is 25.6, and the sample is comprised of 10% who are international students, 37% who live on campus, and 31% who are undecided about what to pursue as a major. We call the number 12% a ________________ and the number 27.9 a ________________