The correct statements are as follows;
42% of the students prefer a concert over a movie.
A greater ratio of 11th graders prefer a concert to a movie
The difference in the percent of students who prefer a movie over a concert is 16%
Given that
A random sample of 184 students at South High School was surveyed on whether they would prefer going to a movie or a concert.
               10th   11th   12th   total
Movie       .18    .16     .24    .58
Concert     .15     .18     .09   .42
Total           .33     .34    .33    1
According to the question
The marginal relative frequency for 10th graders is 0.18.   
This is an incomplete statement.
The marginal frequency is a number, not a percent.
42% of the students prefer a concert over a movie.   
42% preferred a convert to the 58% who preferred a movie.  
This statement is True.
A greater ratio of 11th graders prefers a concert to a movie. 
18/100 concert to 16/100 for the movie for 11th graders.

  More 12th graders were surveyed than any other grade level.
There were more 11th graders surveyed (34%) to (33%) for 12 graders False
The difference in the percent of students who prefer a movie over a concert is 16%.  
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