Final answer:
The proportion of undergraduate students who are freshmen is 0.256 (or 25.6%). The risk of being a sophomore, which means the likelihood of a student being a sophomore, is 0.24 (or 24%).
Step-by-step explanation:
The question asks to calculate the proportion and risk for a given sample of undergraduate students classified by their academic years. Proportion is the ratio of a part to the whole, while risk is commonly interpreted as the chance or likelihood of an event occurring.
A) Proportion of Freshmen
Proportion of Freshmen = Number of Freshmen / Total Number of Students = 64 / 250 = 0.256.
B) Risk of Being a Sophomore
The risk of being a sophomore may refer to the chance of a randomly chosen student from a sample being a sophomore, which is calculated as Number of Sophomores / Total Number of Students = 60 / 250 = 0.24.