Final answer:
In the second survey, 14/17 of the students preferred round chocolate candy.
Step-by-step explanation:
To find the fraction of students in the second survey who preferred round chocolate candy, we first need to determine the total number of students in the second survey. Since the question states that 3/17 of the students changed their preference, this means that 3/17 of the students who initially preferred round chocolate candy changed to hard candy. So, the fraction of students in the second survey who preferred round chocolate candy is 1 - 3/17 = 14/17.