Final answer:
The student's inquiry involves summary statistics and probability analysis within a college-level statistics course.
Step-by-step explanation:
Based on the scenarios provided, the subject deals with summary statistics and probability distributions in the field of Mathematics, specifically within the context of a college-level statistics class. The questions involve various statistical analyses such as determining averages, calculating probabilities, setting up hypotheses for statistical tests, and interpreting data from probability distributions. For example, when looking at how many DVDs customers rent, we would calculate the probability of a customer renting at most two DVDs by summing the probabilities of renting zero, one, or two DVDs according to the given probability distribution. Similarly, when examining whether the average number of jeans owned by young adults is higher than three, we would define our null and alternative hypotheses, identify the appropriate statistical test, and analyze the collected data accordingly.