Final answer:
Option A) The number of people in a randomly selected classroom on campus is a quantitative discrete variable because it involves counting the number of individuals, which can be measured and expressed as a number. The correct answer is A.
Step-by-step explanation:
The question asks which of the following variables is quantitative. Quantitative variables can be measured and are typically presented as numbers. They are further divided into two subtypes: discrete and continuous. A discrete variable is one that can take on a countable number of values, such as the number of shoes you own. A continuous variable is one that can take on an infinite number of values within a given range, such as weight or distance.
Let's analyze each option:
- A) The number of people in a randomly selected classroom on campus. This is a count and hence is a quantitative discrete variable.
- B) The 3 most common brands of car found in the US. This is a categorical listing and therefore is a qualitative variable.
- C) The telephone number of a randomly selected business in town. While numerals represent telephone numbers, they are not inherently quantitative as they are identifiers and not measures or counts.
The only quantitative variable from the options provided is:
A) The number of people in a randomly selected classroom on campus.