A full-time college student has just become a college dropout. the likelihood that alcohol was a factor in the student's dropping out is а bout:

The reason why a college student decides to stop studying it is because they're not interested anymore in anything that the school may offer.

it means that they preffer to spend more time doing something else, could be working since young or because a bad substance has taken the position of the school in the free time of the student, and commontly it is well know that the probabilities of the consuming alcohol a the student's age is 25%, sometimes it is because they're in depression, have problems at home, so they find the solution by drinking alcohol because that way they don't care about those problems, but the thing is that student's are not solving the problem, instead of that they are adding one to theire lifes, because alcohol it is a bad substance that can be letal

About one in four or 25%

Explanation:

Based on a national study of over 14,000 students, it was reported that about 25 percent of college students claimed that their academic problems was caused by alcohol use, which includes earning lower grades, doing poorly on exams or papers, missing class, and falling behind in their school curricular activities.

Also, in another national survey of about 55,026 college students, about 23.5 percent reported performing poorly on a test or assignment was due to alcohol intake.

Hence, it can be concluded that a full-time college student has just become a college dropout had about one in four or 25% likelihood that alcohol was a factor in the student's dropping out.